Petville

Kidney disease in dogs and cats

Kidney failure... kidney disease in the dog and cat is a common and difficult disorder to manage. 
Often called CRF... Chronic Renal Failure, it is seen most often in the older dog or cat. Kidney failure has it origins in a wide variety of causes.  For example, some animals are born with poorly constructed or functioning kidneys and never reach totally optimum health.  Eventually, these individuals usually fall into kidney failure at an early age.  Another type of kidney failure can occur after accidental ingestion of antifreeze that contains ethylene glycol. 

These situations cause sudden and often irreversible renal (kidney) failure. Quite commonly, kidney failure results from low grade, long term (chronic) inflammation of kidney tissues called chronic nephritis; the damage caused by this inflammation renders permanent damage to delicate renal tissues that are not able to repair themselves or heal as some other body tissues do.  Eventually, not enough normal functioning tissue remains to support the body's need for metabolic regulation and waste elimination. The dog or cat becomes UREMIC, a condition where body waste material builds up in the blood. These toxins promote vomiting, poor appetite, depression, and eventually death.  Bacterial invasion of the kidneys is a common cause of chronic nephritis and kidney failure.

The kidneys receive about 20 percent of the heart's blood output and play a vital role in keeping the dog or cat in normal metabolic balance. The glomerular blood vessels have a large endothelial surface which allows for the active and passive transport of many chemicals into and out of the kidneys.

Diabetes mellitus in dogs and cats

Diabetes in the dog and cat and the treatment for diabetes mellitus are interesting and challenging topics.  Diabetes mellitus (DM) is a disorder where the body is unable to regulate blood sugar levels.  (There is another dissimilar disease called Diabetes Insipidus that is associated with the pituitary gland.)  Each case seems to be different, and regulating the diabetic dog or cat so that their blood glucose levels are as normal as possible is vitally important.  The real problem with a diabetic dog or cat is that even in the presence of sugar (glucose) in the blood stream, something interferes with the entry of that sugar into the body's cells where it is required for the life sustaining energy of those cells. With no sugar in the cells, the cell dies in a very short period of time.

A highly complicated disease entity, diabetes has been classified according to what pathway of energy metabolism has been disrupted. 

Fortunately with diabetes mellitus in dogs and cats most cases can be managed successfully with insulin injections. There are several brands of insulin available to veterinarians and your veterinarian may suggest or favor one brand rather than another.  Cats often are managed by use of a PZI (protamine zinc) insulin preparation.  Do not be bashful with your dog or cat's veterinarian if you do not understand the how, why, and when of managing diabetes in dogs and cats.

Typical signs of diabetes mellitus in dogs and cats include excess water consumption and excess urination, increased appetite but with actual weight loss, and dehydration.  Dogs also commonly develop cataracts whereas cats seldom develop cataracts secondary to diabetes mellitus.
...polyuria (PU) - frequent and more productive urination
...polydipsia (PD) - increased water intake
...polyphagia - excessive appetite
...weight loss
...lethargy
...sugar in the urine

Diabetes rising in cats and dogs

MSNBC reports that as with people, the incidence of diabetes in cats and dogs is increasing. Not so much of a problem in decades past, diabetes now affects as many as one in 50 of the animals, some statistics show, especially pudgy pets.

“There is no question from what I know that is published in the literature that obesity is on the rise, No. 1, and No. 2, diabetes is on the rise right along with it,” says veterinarian Robin Downing, hospital director of Windsor Veterinary Clinic in Windsor, Colo.

Diabetes results when the body doesn't produce enough insulin, a hormone that processes glucose (blood sugar), or properly use it. As a result, the body's tissues cannot use glucose for energy, and the sugar builds up in the blood and urine.

Veterinarians say that while obesity clearly is linked to diabetes in pets, it appears to contribute to the disease differently in cats and dogs.

Fat cats are prone to diabetes because they develop insulin resistance, meaning their bodies don't effectively use insulin. As a result, the pancreas pumps out more insulin as well as another hormone called amylin.

With dogs, obesity is associated with an increased risk of pancreatitis — an inflammation of the pancreas — which can then lead to diabetes because the body doesn't make enough insulin.

A change to a high-protein, low-carbohydrate diet — nicknamed the “Catkins” diet — can promote weight loss and make diabetes more manageable in cats, often sending them into remission so that they no longer require insulin injections. At the Windsor Veterinary Clinic in Colorado, three out of every four diabetic cats have their disease controlled through diet alone.

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Hyperthyroid Disease in Cats

There are a number of options for feline patients that need treatment for Hyperthyroidism, including radiation therapy and oral medications.  Be sure to consult with your veterinarian regarding specific treatment and therapy for your cat if hyperthyroidism is a problem.

Hyperthyroid disease in cats is common and is usually discovered in older cats that lose weight but yet eat well, and seem otherwise healthy.  Take a look at Hyperthyroidism in cats as explained by an experienced veterinarian...

“Doctor, is there something wrong with my cat, Tigger? She's losing weight but she can’t be too sick because her appetite is terrific!”

I encourage this concerned pet owner to bring Tigger in for an examination. Further questioning revealed some important clues to solving her health problem. The owner told me that Tigger has seemed restless for several months, wandering around the house at night, yowling and making a terrible racket. The owner also told me that Tigger has had occasional diarrhea and vomiting, and these symptoms have become more frequent.

During the physical exam, several abnormal findings are noted. Tigger is very thin with a poor, dull haircoat. She is very Weight loss, rapid heart rate, good appetite, poor coat... could be Hyperthyroidism in this cat. anxious and restless on the exam table and her heart rate is very fast... more than 200 beats per minute! (average is 110 - 140 beats per minute.)  As I continue the examination, I think I can feel a lump in the neck area. At this point, I am pretty sure that I know what is causing Tigger to be ill, and I explain to the owner that some blood tests will help confirm the diagnosis. When the blood test is back, we discover that the Tigger’s thyroid hormone level is more than twice what it should be. We have our answer- feline hyperthyroidism.

Hyperthyroidism is one of the most common diseases of the middle-aged and older cats. It is a disorder that ultimately affects many of the body systems. It is caused by an increase in the amount of thyroid hormones produced by enlarged thyroid glands. First documented 30 years ago, the actual cause of the disease remains a mystery. In most cases, the enlargement in the thyroid gland is caused by a non-malignant tumor called an adenoma. In very rare cases, a malignant form of this disease is seen.

The thyroid glands are located in the front of the neck on each side of the trachea (windpipe). Normally, they are tiny, about ¼ inch long, and difficult to feel through the skin. If the glands begin to enlarge, the veterinarian may be able to feel them. Hyperthyroidism is diagnosed by checking levels of the thyroid hormone in the blood. Since these levels can fluctuate daily, sometimes repeat testing or special thyroid function testing may be necessary for diagnosis.

The most common symptoms of this disease include weight loss, increased appetite, increased thirst, restlessness, unkempt hair with excessive shedding and matting, vomiting and/or diarrhea (although these symptoms are often sporadic). Because of the effects of the thyroid hormone levels on the heart, these patients have a fast heart rate, and may have a heart murmur, high blood pressure, difficulty breathing, and other heart problems.  It is important to note that not all of these symptoms may be present in every cat.  Therefore, any middle-aged to older cat that presents with any of the above symptoms should be screened for hyperthyroidism.

Toxoplasmosis

This disease of cats and other mammals is caused by a parasitic protozoan, Toxoplasma gondii. Protozoa are single-celled organisms but are not in the same classification as bacteria. They are among the simplest creatures in the animal kingdom. Cats that hunt and consume raw meat will have the greatest chance for contracting Toxoplasmosis. Ingestion of tissue cysts in infected prey or in other raw meat is probably the most common route by which cats are exposed to Toxoplasma. Although infection with Toxoplasma is fairly common in cats, actual disease caused by the parasite is relatively rare. Cats are able to shed Toxoplasma in their feces for a few weeks after they are first infected with the parasite. And as in humans with the disease, cats rarely have symptoms when first infected. A cat can remain healthy appearing and yet have the organism within their bodies. There are no good tests available to determine if your cat is passing Toxoplasma in its feces.

Acutely infected cats might display lethargy, depression, poor appetite, lesions in the retinas of the eyes, weight loss and fever. Liver and lung abnormalities may occur. Any cat that displays a brain disorder such as incoordination, sensitivity to light, constricted pupils, circling, personality changes or other central nervous system abnormalities should be evaluated for Toxoplasmosis.

Feline Leukemia Virus (FeLV)

This virus, for which there is a very effective vaccine, is transmitted by cat-to-cat contact. It severely limits the cat’s immune systems ability to ward off all sorts of infections. Cats affected with FeLV may be carriers of the virus for long periods without displaying any ill effects. Occasionally, if stressed by surgery or being lost outside or injury, a cat that is harboring the virus… and seemed to be healthy… will develop clinical signs. Sick cats may have periods of time when they will seem healthy only to have relapses of illness. It is commonly fatal over a period of time.

Feline Distemper / Panleukopenia

This viral infection is totally unrelated to Canine Distemper. In fact each disease has no true effect on the animal’s personality or temperament at all so the name "distemper" is rather misleading. This virus primarily affects young kittens but has been known to affect older cats as well. The disease lowers the animal’s immune defenses by severely depressing all white blood cell production. That is why the name Panleukopenia is more appropriate in that it means “all white blood cells are abnormally low in numbers”. The disease makes cats pass bloody, liquid stool due to the severe hemorrhaging it produces along the small intestine. A high fever is present, the cat is depressed and will refuse any food or water. Vomiting and dehydration add to the cat’s distress and recovery, even with strong therapeutic measures, is rare.

Rabies

Rabies is a fatal viral disease spread by the saliva of an infected warm blooded animal. It can be prevented in cats by the use of proper vaccines. However, once the rabies virus is present within the animal it spreads through the nerve tissue and eventually affects the brain in such a severe manner that the cat will become highly agitated and possibly aggressive. In other cases the cat will become very depressed and withdrawn. More common in feral or free roaming cats, Rabies exposure always presents a serious public health hazard. Even indoor cats have potential for contracting Rabies if there happens to be the opportunity for bats to get into the home. Bats, foxes, raccoons, coyotes and skunks rank high in the number of Rabies cases diagnosed in free roaming animals. Cats are natural hunters and will seek out small animals such as bats. Always contact your veterinarian and physician if you are bitten by any animal. And keeping you feline friend up to date on Rabies vaccine provides you with a safety buffer between your cat and potential outdoor carriers of Rabies virus.