Fleas are blood-feeding parasites that can infest many species of birds and mammals. Although fleas on dogs and cats don’t infest people, fleas may bite people if an area is heavily infested. Flea infestation is one of the most common medical problems veterinarians see, and pets suffer greatly from this condition. Flea bites can trigger severe allergic reactions in some pets. The intense itching caused by flea infestation causes pets to scratch and bite themselves. This can lead to skin wounds, skin infections, and general misery for your pet. Even if your pet is not allergic to flea bites, fleas can transmit serious diseases, such as bartonellosis (the bacteria that causes “cat scratch disease” in people), and other parasites, like tapeworms.

A radiograph (sometimes called an x-ray) is a type of photograph that reveals the body’s internal organs. The procedure for obtaining a radiograph is called radiography. Radiography is a very useful diagnostic tool for veterinarians because it can help obtain information about almost any organ in the body, including the heart, lungs, and abdominal organs, as well as the bones.

Fluid administration is a regular part of veterinary medical care. Any time that a patient is dehydrated or needs fluids, your veterinarian determines the best way to provide them. Fluids can be given by mouth, injection into a vein (known as intravenous fluids or IV fluids), or injection directly under the skin – a procedure known as subcutaneous fluid administration.

Fluid administration is a regular part of veterinary medical care. Any time that a patient is dehydrated or needs fluids, your veterinarian determines the best way to provide them. Fluids can be given by mouth, injection into a vein (known as intravenous fluids or IV fluids), or injection directly under the skin – a procedure known as subcutaneous fluid administration.

While the estimates vary, approximately three to four million dogs and cats are euthanized (“put to sleep”) each year in the United States because too few people spay or neuter the pets they have, too few adopt their new pets, and too many give up their pets. Because space at shelters is limited, staff members must make the difficult decision to euthanize healthy animals that aren’t adopted within a certain amount of time.

The most common and serious behavior problems of dogs are associated with aggression. Canine aggression includes any behavior associated with a threat or attack (e.g., growling, biting).

Some animals may have several of these clinical signs, whereas others may have only one—perhaps an ear infection.

Bordetella bronchiseptica (B. bronchiseptica) is a bacterium that is commonly associated with respiratory disease in dogs. It can also infect cats, rabbits, and, in rare cases, humans. It is one of the most common bacterial causes of canine infectious tracheobronchitis, which is also sometimes called kennel cough. B. bronchiseptica is highly contagious, easily transmitted through direct contact or the air, and resistant to destruction in the environment.

Blood testing is commonly used to help diagnose disease or pinpoint injury in animals. It can also help determine the state of your pet’s health during regular physical exam visits. Although a CBC or a chemistry profile can be performed separately, these tests are frequently done at the same time; when the results are interpreted together, they provide a good overview of many of the body’s functions. As with any other diagnostic test, results of a CBC and chemistry profile are not interpreted in a vacuum. Your veterinarian will combine this information with physical exam findings, medical history, and other information to assess your pet’s health status and determine if additional testing should be recommended.

Anesthesia is defined as the loss of ability to feel pain. However, the term anesthesia is more commonly used to refer to a state of deep sedation or unconsciousness during which a patient is unable to feel pain.

Arthritis is a joint problem that can reduce mobility and cause pain. Often seen in older dogs, arthritis can by caused by injury, infection, the body’s own immune system, or developmental problems. The most common form of arthritis is called osteoarthritis (osteo = bone; arthr = joint; itis = disease) or degenerative joint disease. Normally, joints form smooth connections between bones. Osteoarthritis involves thinning of joint cartilage (a protective cushioning between bones), buildup of fluid within the joint, and the formation of bony growths within the joint. Over time, this can lead to reduced joint mobility as well as pain. Osteoarthritis affects one of every five dogs.

Diabetes mellitus is an illness caused by the body’s inability to either make or use insulin, which is a hormone produced and released by specialized cells in the pancreas. Insulin permits the body’s cells to take sugar (glucose) from the blood and use it for their metabolism and other functions. Diabetes mellitus develops when the pancreas doesn’t make enough insulin or when the body’s cells are unable to use available insulin to take glucose from the blood.

Canine parvovirus is a deadly disease that is caused by the canine parvovirus type 2 (CPV-2) virus. The virus attacks the gastrointestinal tract and immune system of puppies and dogs. It can also attack the heart of very young puppies.

With many dogs living well into their teens, many owners wonder: When is a dog truly senior? The answer is that there is no specific age at which a dog becomes senior. Individual pets age at different rates. However, most dogs become senior at 7 to 10 years of age, and most large- and giant-breed dogs become seniors earlier than small-breed dogs.

A radiograph (sometimes called an x-ray) is a type of photograph that reveals the body’s bones and internal organs. The procedure for obtaining a radiograph is called radiography.  Radiography is a very useful diagnostic tool for veterinarians because it can help obtain information about almost any organ in the body, including the heart, lungs, and abdominal organs, as well as the bones.

Your home can hold a lot of unrecognized dangers for your pet. Many common food items or household products can sicken or even kill animals. However, a few simple precautions can help keep your pet safe.

Constipation is a condition in which cats pass feces less often or in smaller amounts than normal. Feces are often hard and dry, which may cause cats to strain or have difficulty passing feces. While constipation may occur periodically, obstipation is a more persistent and severe form of constipation, in which defecation is impossible or nearly impossible.

Grief is a natural reaction to the loss of a pet. Regardless of whether the pet is old or young, or whether the loss is expected or sudden, family members and other people who were close to the pet will experience similar feelings when a beloved pet dies. These feelings, commonly called the five stages of grief, are the same as those experienced when a person passes away.

Declaw surgery, also known as onychectomy, generally involves the surgical removal of the claw and all or a portion of the last bone in each digit. It is usually performed on the front paws only. Younger cats (under 1 year of age) tolerate the procedure better than older or obese cats that bear more weight on their paws.

Bad breath in pets may be a sign of periodontal disease that could lead to other health problems. Periodontal disease starts when plaque (a bacterial film) coats the tooth. Plaque hardens (calcifies) into tartar, a thick yellow or brown layer on the teeth. Tartar can irritate the gums, creating an environment where bacteria thrive. As the disease progresses, the gums become tender, red, and swollen and the bacteria continue to multiply. Eventually, the inflamed gums pull away from the teeth, creating pockets that trap more bacteria and food particles. The gums bleed, the roots of the teeth may become exposed, teeth may become loose, and your pet may feel pain when eating. If the bacteria enter the bloodstream, they can create problems for organs such as the heart, lungs, liver, and kidneys.

A radiograph (sometimes called an x-ray) is a type of photograph that reveals the body’s bones and internal organs. The procedure for obtaining a radiograph is called radiography.  Dental radiography involves obtaining x-ray images of the mouth, teeth, and jaws. Radiography is painless, safe, and completely noninvasive.

Exercise can have many health benefits for your dog. Regular exercise burns calories, reduces appetite, improves muscle tone, increases metabolism, and improves temperature regulation. It can be a valuable contributor to weight loss and maintenance. Exercise can also help stimulate your dog’s mind, thereby preventing boredom and destructive behaviors.

Our companion animals are often treasured members of the family, and we mourn for them when they die or are euthanized. It is important to recognize your feelings of loss and grief and to express them in your own way. In addition, when your child is attached to a pet that dies or is euthanized, it is important to recognize his or her feelings of loss and help your child express those feelings.

Feline asthma is a respiratory condition that involves constriction and inflammation of the airways in the lungs. Any cat can develop asthma. The underlying cause of asthma remains unknown, but allergens in the air have been implicated in some cases. When a cat develops asthma, mucus forms in the respiratory tract, and the airway walls swell and spasm. These changes can cause wheezing, coughing, and difficulty breathing. Without treatment, a severe asthma attack can even be fatal.

Diabetes mellitus is an illness caused by the body’s inability to either make or use insulin, which is a hormone produced and released by specialized cells in the pancreas. Insulin permits the body’s cells to take sugar (glucose) from the blood and use it for their metabolism and other functions. Diabetes mellitus develops when the pancreas doesn’t make enough insulin or when the body’s cells are unable to use available insulin to take glucose from the blood.

Most cat owners appreciate some vocalization—meowing, purring, etc.—from their cats. The many sounds that cats make help us communicate with them by telling us what they like, dislike, want, and need. However, some cats vocalize excessively, which can become annoying to owners. Excessive vocalization is called hypervocalization.

Feline immunodeficiency virus (FIV) is contagious among cats. Although FIV is not contagious to humans, FIV has some similarities to the human immunodeficiency virus (HIV) and has been used to help researchers better understand HIV.

With many cats living well into their teens or even twenties, many owners wonder: When is a cat truly a senior citizen? The answer is that there is no specific age at which a cat becomes “senior.” Individual pets age at different rates.

Upper airway infections in cats often resemble the common cold in people. Cats, especially kittens, often get upper airway infections. If your cat shows any signs of respiratory illness, such as sneezing, wheezing, or discharge from the eyes or nose (see box), make an appointment with your veterinarian right away. Depending on their cause, upper airway infections can quickly become serious, especially in kittens. In adult cats, untreated infections can lead to other (secondary) infections or damage delicate sinuses, resulting in chronic problems.

Urine flows from the kidneys down the ureters and into the bladder, where it is stored until it is released through the urethra. A urethral obstruction occurs when the urethra becomes blocked, preventing urination. There are many possible reasons for a blockage, including urinary stones, mucus or sediment plugs, blood clots, tumors, and scarring.  Although any animal is susceptible to a urethral obstruction, male cats are at greater risk for urethral blockage than dogs or female cats because their urethras are narrow and long, making them easier to plug. 

Feline urine marking is a behavior in which cats mark a location with urine to notify other cats of their territory. Often it occurs near door and windows as a way to communicate to neighborhood tomcats wandering through the yard. Although this is a normal behavior in cats, most owners consider it unacceptable when it occurs in the house. Any cat can exhibit marking behaviors, but it tends to occur in male cats that have not been neutered.

Dealing with an injured pet can be scary and frustrating. In many cases, you don’t know how bad the injury is, and your pet may not be acting normally. If your pet is injured, the first thing you need to do is try to remain calm. If possible, try to determine how severe the injury is, but remember that caution is extremely important when approaching an injured animal. Any pet, no matter how calm or friendly he or she may usually be, can bite or scratch when in pain.

Flea allergy dermatitis (FAD) is a severe allergic reaction to a flea bite. Both dogs and cats can develop FAD. Affected pets have an extreme allergic reaction to certain proteins in the flea’s saliva, which the flea injects into the pet’s skin during biting and feeding. Some pets are so allergic that even a single bite can cause a reaction.

Fleas and ticks are external parasites that can cause extreme discomfort for your pet and can also cause serious diseases.

If your pet is being treated by a veterinarian, it’s likely that you will be asked to return for a follow-up examination. This physical examination is usually scheduled a few weeks after the initial examination and may be done for a number of reasons.

Food allergy (also called food hypersensitivity) refers to a type of physical reaction to food. Food reactions are classified into two categories: those that are the result of immune system stimulation and those that are not. Food allergy occurs when the immune system begins to overreact to ingredients that the pet has eaten with no problems in the past. Food intolerance occurs when what is eaten has a direct, negative effect on the stomach and/or intestines, such as spoiled meat, chewed up toys, food additives, and abrupt changes in diet. Food intolerance is not an immune reaction.

Gastric dilation–volvulus (GDV), or “bloat,” is a life-threatening condition in which a dog’s stomach fills with air and becomes twisted. Gas builds up in the twisted stomach and stretches it. This stretching, also called distention, is extremely painful and limits the amount of blood that can reach other parts of the body. When blood can’t reach body tissues to supply oxygen, those tissues can die. GDV is an emergency situation, and if not treated immediately, it can be fatal. While any size or breed of dog can develop this condition, it is more common in larger-breed dogs with deep chests, like German shepherds, golden retrievers, and Great Danes.

Whether animals feel emotions in the same way people do is a mystery. However, their behaviors are commonly interpreted as reliable expressions of mood—for example, relaxed, fearful, or aggressive. Based on observed changes in behavior, it is thought that some dogs and cats grieve after losing a close human or animal companion. In 1996, the ASPCA conducted a study of mourning in companion animals and found that more than half of dogs and cats had at least four behavioral changes after losing an animal companion. Many of these changes, such as eating less and changes in sleep patterns, were similar to behaviors exhibited by grieving people.

Heartworm disease is a serious and potentially fatal condition that affects dogs, cats, and up to 30 other species of animals. It is caused by parasitic worms (heartworms) living in the major blood vessels of the lungs and, occasionally, in the heart. These worms are transmitted (as microscopic larvae) through the bite of an infected mosquito. The scientific name for the heartworm parasite is Dirofilaria immitis.

Hookworms are internal parasites that generally live in the small intestines of puppies, kittens, dogs, and cats. These worms attach to the intestinal tissue and suck blood and other nutrients from their hosts.

Many eye conditions in dogs require medicine to be put directly into the eye. This procedure can be relatively easy, as long as you follow a few simple guidelines. The most important guideline is to always put health and safety first. If, for any reason, your dog becomes so agitated that you feel you are at risk of being bitten, stop. If the procedure seems excessively painful for your dog, stop and get your veterinarian’s advice.

Many eye conditions in dogs require medicine to be put directly into the eye. This procedure can be relatively easy, as long as you follow a few simple guidelines. The most important guideline is to always put health and safety first. If, for any reason, your dog becomes so agitated that you feel you are at risk of being bitten, stop. If the procedure seems excessively painful for your dog, stop and get your veterinarian’s advice.

Many conditions in cats require medicine to be applied to the skin. This procedure can be relatively easy, as long as you follow a few simple guidelines. The most important guideline is to always put health and safety first. If, for any reason, your pet becomes so agitated that you feel you are at risk of being bitten or scratched, stop. If the procedure seems excessively painful for your pet, stop and get your veterinarian’s advice.

Many conditions in dogs require medicine to be applied to the skin. This procedure can be relatively easy, as long as you follow a few simple guidelines. The most important guideline is to always put health and safety first. If, for any reason, your pet becomes so agitated that you feel you are at risk of being bitten, stop. If the procedure seems excessively painful for your pet, stop and get your veterinarian’s advice.

Medicines in pill or capsule form are prescribed to treat a variety of conditions, but many cats dislike taking pills. Some medicines that are usually prescribed as pills or capsules can be changed (compounded) to a liquid or a powder for easier administration. If you have trouble giving your cat pills, ask your veterinarian if compounding is possible for specific medicines.

Medicines in pill or capsule form are prescribed to treat a variety of conditions, but many dogs dislike taking pills. Some medicines that are usually prescribed as pills or capsules can be changed (compounded) to a liquid or a powder for easier administration. Some medicines for dogs come in a chewable “treat” form. If you have trouble giving your dog pills, ask your veterinarian if compounding is possible or a treat form is available for specific medicines.

Hypertension, or high blood pressure, occurs when blood moves through the body’s arteries with too much force. Blood pressure can be increased by several factors, including faster heart rate and increased cardiac output (the amount of blood that is sent out into the body with each heartbeat). In animals with hypertension, the increased force or “pressure” of the blood damages the arteries as the blood tries to move through. Imagine a firefighter trying to force a high-powered stream of water through a garden hose. The pressure would tear the hose apart. Similar damage to the body’s arteries is possible if high blood pressure is left untreated.

If your older cat starts losing a lot of weight despite having a ravenous appetite, the problem might be hyperthyroidism. Hyperthyroidism occurs when a cat’s thyroid gland (an organ located at the front of the neck) produces excess amounts of thyroid hormone. The problem is usually caused by a benign (noncancerous) tumor on the thyroid gland, although a small percentage of thyroid gland tumors in cats can be malignant (cancerous).

Kidney disease is a very general term used to describe any one of several conditions that can affect the kidneys or damage kidney cells. If kidney disease progresses, it can eventually lead to kidney failure and death.

Leptospirosis is a potentially serious disease caused by the bacterium Leptospira interrogans. It affects dogs but can also infect a wide variety of domestic and wild animals and humans. The bacteria can survive for long periods of time in water and are frequently found in swamps, streams, lakes, and standing water. The bacteria also survive well in mud and moist soil, and localized outbreaks can occur after flooding. Infected animals can continue to shed the bacteria in their urine for months or even years after recovery. Carriers of the bacteria include raccoons, opossums, rodents, skunks, and dogs. The disease is transmitted to dogs when they have contact with urine or contaminated water or soil.

A lick granuloma is thickened, raised area of skin that is often hairless, inflamed, infected, or ulcerated, resulting from excessive, repetitive licking or chewing. These lesions are typically found on the lower legs, and may occur alone or on more than one limb.

A lipoma is a benign (noncancerous) mass that is made of fat cells. Owners often notice these lumps on the chest, abdomen, and limbs of their pets, but lipomas can also occur inside the chest and abdomen.

Cats are usually easy to litterbox train because they are naturally clean and prefer to bury their waste. First, make sure that your cat knows where the litterbox is. Confine your cat to a small area or room with clean water, fresh food, and a clean litterbox until he or she is successfully using the litterbox and seems comfortable. Do not use a covered litterbox during the training period because it might complicate the process. If your cat urinates or defecates outside the litterbox, place the waste in the litterbox; the smell should help your cat find and use the litterbox in the future. If your cat isn’t using the litterbox after a day or two, do the following: After your cat eats, place him or her in the litterbox, and briefly scratch the litter with your finger. However, don’t force your cat to stay in the litterbox; you don’t want your cat to have a negative experience in the litterbox.

Lyme disease is an infection caused by the Borrelia burgdorferi bacterium. Lyme disease is transmitted through the bite of an infected tick and can affect many species, including dogs and humans.

More than 85% of cats over 4 years of age have evidence of periodontal disease. Periodontal disease is a progressive inflammation of the supporting structures surrounding the teeth and is the main cause of early tooth loss.

Your veterinarian can see signs of gingivitis and tartar buildup by examining your dog’s mouth. However, since most periodontal disease occurs beneath the gum line, the only way to truly assess your dog’s mouth is to perform an examination while your pet is under anesthesia. Your veterinarian can use a dental probe to measure any loss of attachment around each tooth and take dental radiographs (x-rays) to assess for bone loss, abscesses, and other problems.

Pet insurance can help you budget for unforeseen medical expenses for your pet. Generally, the premium cost for a good policy is low compared with the relative peace of mind and financial help it can offer. Sorting through the various plan choices and options, however, can be daunting. Here are some tips to help you make sense of the process.

Animals that have seizures are often given phenobarbital to help control and prevent seizure activity. Many animals, especially those with epilepsy, require lifelong therapy with phenobarbital. Because animals can absorb and metabolize this medication differently, it’s important to monitor blood levels on a regular basis.

During your pet’s examination, your veterinarian will ask you many questions about your pet’s behavior, lifestyle, and health history since your last visit. The answers to these questions will help your veterinarian determine what preventive care recommendations he or she should make to help keep your pet healthy. Based on your pet’s age, lifestyle, and disease risk, your veterinarian will recommend vaccinations for your pet.

Despite the name, ringworm is not caused by worms, but by a fungus. Most infections in pets are caused by one of three types of fungi, the most common being Microsporum canis. The fungi invade the superficial layers of the skin, hair, and/or nails. Because fungi thrive in moist environments, these organisms are especially persistent in humid climates and damp surroundings.

Roundworms are extremely common parasites that spend their adult lives in the intestines of puppies, kittens, dogs, and cats. There are several species of roundworms. Some can grow to about seven inches in length and cause severe illness, especially in younger pets.

Sarcoptic mange (scabies) is an intensely itchy skin condition of dogs that is caused by microscopic mites called Sarcoptes scabiei.

Separation anxiety is a behavior problem in which a dog panics after (and sometimes before) being left alone. Dogs with this problem may vocalize, pace, urinate, defecate, and/or engage in destructive behavior before and/or after their owner leaves. Escape attempts by affected dogs can result in self-injury and household destruction, especially around windows and doors.

A wide variety of skin and coat conditions can cause your pet to itch and scratch, but pinpointing the problem can sometimes be difficult because many skin disorders have similar outward signs. Below are four major categories of skin conditions seen in cats and dogs.

Spaying and neutering are surgical procedures used to remove the reproductive organs of dogs and cats. Spaying is the removal of the uterus and ovaries of a female dog or cat. Neutering is the removal of a male dog’s or cat’s testicles. These procedures are also sometimes referred to as “sterilizing” or “fixing” pets.

Dogs may urinate inappropriately in response to a perceived threat, which may be intentional (for example, when an owner scolds the dog) or unintentional (for example, when an owner displays a dominant behavior, such as looking directly into the dog’s eyes). Submissive urination is the dog’s way of communicating that he or she is not a threat and is submitting to the person’s dominance.

Cats that don’t go outside are protected from many warm weather hazards, but only if the temperature inside the home remains within a healthy range. In an effort to reduce energy usage and costs, some pet owners shut off fans and air conditioning when they leave the house in the morning and turn them on when they return later in the day. However, when temperatures outside reach dangerous levels, temperatures inside the house can, too. Being shut inside a hot house can be dangerous for your cat. Like dogs, cats can rely on panting to cool themselves off. When the temperature in the environment increases, panting becomes less effective. This means that your cat could be locked inside with minimal options for cooling down. 

A wellness examination is a complete physical examination along with diagnostic testingthat may include bloodwork, urinalysis, and checking a stool sample for parasites. In many cases, a wellness examination can help detect the early stages of disease. Often, your veterinarian will schedule this exam when your pet is due for vaccinations.

Ticks are small, eight-legged parasites that must drink blood in order to survive and reproduce. Ticks don’t fly, and they can’t jump (unlike fleas). In fact, ticks are more closely related to spiders and mites than to “insects” like fleas. Of the hundreds of tick species, approximately 80 are found in the United States. Ticks can feed on a variety of hosts including birds, dogs, cats, and people.

Obviously, if a dog will be working as a search and rescue dog or service assistance dog, proper training is extremely important. But what if you’re just looking for a dog to share your life and be a couch potato with you? In truth, even companion dogs, large and small breeds alike, need training to learn proper behavior among people and other dogs.

The urinary tract consists of four parts:

1. Two kidneys, which produce urine
2. The ureters, tubes that transport urine from the kidneys to the bladder
3. The urinary bladder, where urine is stored
4. The urethra, which carries urine from the bladder to the outside

Any part of the urinary tract can be affected by disease.

Kidney failure: Acute kidney failure is the sudden loss of kidney function, which may be caused by a number of factors, including decreased blood pressure, toxins such as antifreeze, ureteral or urethral obstructions, and diseases, such as leptospirosis and Lyme disease. If diagnosed early and treated aggressively, acute renal failure may be reversible. Chronic kidney failure is long-term loss of kidney function that cannot be reversed, but treatment may help slow the progression of the disease.

Vestibular disease is an illness that affects a group of small organs called the vestibular apparatus. The vestibular apparatus is located in the brain and inner ear. These organs are responsible for an animal's ability to remain balanced, detect the degree of head rotation, and determine overall body position. Vestibular disease can result if the vestibular apparatus is damaged.

Euthanasia is the painless, humane termination of life. There are times when medical science has exhausted all of its capabilities and euthanasia is the only way to prevent an animal from suffering needlessly. However, the decision regarding when to euthanize is fraught with medical, financial, ethical, religious, moral, and sometimes legal considerations. Euthanasia is therefore a medical procedure that needs to be discussed (however painful that discussion may be) and considered fully before a final decision is made.

Cats that spend time outdoors are exposed to various environmental and physical dangers. In the winter, cats are at risk for frostbite and hypothermia (low body temperature), just like humans. Cats should not be left outside for long periods of time in the winter and should always have the option of coming inside. It’s important to be aware of these risks, so you can keep your cat safe and healthy.