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Kidney Disease in Cats and Dogs

By Dr. Jean Hofve, Veterinarian Advisor


Kidney disease is a frequent problem in older cats and dogs. Kidney failure can develop in young animals, but it is far more common in pets over age 10. It is the leading cause of death in older cats.

In the Pet Food Recall of 2007, melamine contamination of pet food caused tens of thousands of cats and dogs to develop Acute Renal Failure (ARF). Many of the pets who got sick but recovered likely suffered some kidney impairment, and may ultimately develop Chronic Renal Failure (CRF). In that case, age makes no difference; animals of all ages were affected.

The kidney filter out and excrete toxins from the body through the urine. Healthy kidneys conserve water and concentrate toxins into a smaller amount of liquid to be urinated away. The kidneys have a very large reserve capacity, and symptoms of failure are not seen until approximately 75% of kidney tissue is nonfunctional. When the kidneys are damaged, they become less able to concentrate the urine. Because they’re losing water in the urine, they need to drink more—but because they’re drinking more, they urinate more. So the first and most noticeable symptom is usually an increase in water consumption and urination ("drink-a-lot, pee-a-lot syndrome").

As the kidneys lose function, other signs of CRF may occur, such as weight loss, nausea, constipation, low energy, fatigue, and poor appetite. A blood test and urinalysis should be done if you notice these symptoms, as there are many conditions that can cause them. A blood test and urinalysis are necessary to accurately diagnose CRF.

The measurement of urine concentration is called Urine Specific Gravity (USG). If the USG is low (less than 1.035 in cats, and 1.030 in dogs) and there are abnormal levels of two other compounds, then kidney function is reduced. The first, BUN (blood urea nitrogen), may be high if the animal is dehydrated, or eats a very high protein diet. However, as long as the kidneys are able to concentrate the urine, small elevations in BUN are usually not a cause for alarm. The second is a protein called creatinine. Creatinine is a more sensitive measurement of kidney function; an increase in creatinine usually means that the kidneys are having problems. In advanced disease, an increase in phosphorus is also seen, and indicates that 85% of kidney tissue is damaged.

 
 

Treating CRF

No conventional or alternative medical treatment can reverse CRF, since the disease involves the death of kidney cells and replacement by scar tissue. The rate of progression in any individual pet may be slowed, but not stopped, by various treatments. When the process is advanced, the kidneys become scarred, small, and lumpy, and the amount of functional tissue is greatly decreased. The most significant problems caused by the loss of function are build-up of blood toxins, and anemia. These can cause weight loss, lethargy, vomiting, loss of appetite, weakness, and other signs of illness.

Some of the best and simplest treatments include:

Diet: The Protein Controversy

You may have heard that restricting protein is recommended for pets in kidney failure. This has been the "standard" treatment for decades in dogs and humans. However, in cats, it remains controversial.

The real culprit is not protein but phosphorus, which combines with calcium and gets deposited in the kidneys, causing further damage. Meat contains a lot of phosphorus, so the easiest way to restrict phosphorus is to restrict meat protein. Decreasing phosphorus intake (by restricting protein) can help some pets feel better, so it may be worth a try if the symptoms are a problem.

However, some studies have suggested that excessive restriction of protein in cats may actually cause further damage to the kidneys and other organs, because there is not enough protein for normal body maintenance and repair. Experts say that these diets are not appropriate for cats until the BUN (Blood Urea Nitrogen) is at least double what it should be normally (about 60-80 mg/dl), and should never be fed to kittens or healthy cats.

For many animals, a diet with HIGH QUALITY protein will be better than a low-protein diet. Low-protein diets, if not carefully managed, can lead to malnutrition. If a low-protein diet is necessary, bear in mind that non-prescription canned foods are much higher in protein than similar dry foods, but prescription-type foods typically contain poor quality ingredients.

Canned foods universally contain higher levels of protein than dry foods. Since dogs are more omnivorous and are better at keeping themselves hydrated than cats, they may do well with mostly dry food. For dogs, these dry foods contain less protein:

Over-the-counter canned foods vary tremendously in phosphorus content, from less than 150 mg to over 600 mg! Veterinary low-protein diets are severely restricted, containing less than 100 mg of phosphorus per 100 Calories.

Cats are exclusively carnivorous and, because they tend not to drink enough water, don’t do as well with dry food as a mainstay of their diet. Canned cat foods containing about 200 mg or less of phosphorus include:

Because water balance is so crucial, it is best to feed cats a high-moisture diet to help maintain good hydration; do not feed only dry food. Feeding mostly or only canned, raw, or homemade food, even though they tend to be high in phosphorus and protein, provides the moisture and calories they need, in a very palatable form that most cats will happily eat. If your veterinarian insists on a protein-restricted, low-phosphorus renal diets, get the canned version. Adding egg whites, which contain very little phosphorus, will provide extra protein without causing harm. Dry cat food causes dehydration even in healthy cats, and is not appropriate for CRF cats (see the posts on Switching Foods for help).

The best thing you can do is feed a home-prepared diet; but only if the cat will eat it! If the cat has never eaten homemade food, or does not have a hearty appetite, this is not a good time to switch! There are several good books on home cooking for animals, including Dr. Pitcairn's Guide to Natural Health for Dogs and Cats, by Richard Pitcairn, DVM, and Susan Pitcairn (Rodale Press. ISBN 075962432 and Home-Prepared Dog and Cat Diets: the Healthful Alternative by Donald R. Strombeck, DVM. (Iowa State University Press. ISBN 0813821495.) If you choose to use Dr. Strombeck's recipes, I suggest substituting 1 capsule of taurine (250 mg) for the canned clams, since clams do not contain enough taurine for proper maintenance. For an easy starter diet, check out the Little Big Cat website.

 

"…a diet with HIGH QUALITY protein will be better than a low-protein diet."


 

Nutritional Supplements

Several nutritional supplements may be helpful for pets with kidney disease. Omega-3 fatty acids have been shown to be beneficial in CRF. Be sure to select a product that contains only omega-3 (pets get plenty of omega-6 in their food), that is free from contaminants, and doesn’t come from farmed fish such as salmon. I recommend the following:

  • Nordic Naturals Omega-3 Pet
  • Only Natural Pet Wild Alaskan Salmon Oil
  • Nature’s Logic North Atlantic Sardine Oil

B-vitamins help the animal cope with stress and replace water-soluble vitamins that are lost in the urine. Antioxidants, such as vitamins C and E, are also important. Potassium supplements may be needed, especially for cats. Kidney support supplements, like Renal Essentials by Vetriscience (for dogs or for cats), can be great all-in-one supplements that contains herbs, Omega 3 fatty acids, and vitamins B and C.

Recent research shows a benefit from probiotics (friendly bacteria) in cats with CRF. Kidney blood values (BUN and creatinine) decreased significantly when cats were given probiotics in canned food.

A newly published paper suggests that melatonin could be helpful in CRF animals; however the study was done in rats, and appropriate dosages for pets are still unknown. As new information becomes available we’ll post updates on our Only Natural Pet Blog, so check back often!

A nutritional supplement called "Renafood" from Standard Process, is a very good renal detoxifier and helps to maximize kidney function. Give one or two a day. Most pets eat them readily if they are crushed into powder and mixed with canned or homemade food. Call Standard Process at 1-800-558-8740 to find a distributor in your area. Renafood is a human product that works much better than their pet products, so be sure to insist on Renafood.

Always consult with your veterinarian before starting your dog or cat on any new herb or supplement when dealing with kidney disease.

Supplemental Fluids

Your veterinarian can give your pet subcutaneous fluids in the clinic, or teach you how to give them at home. This is the least intrusive and most beneficial treatment you can give your pet. Animals in renal failure drink a lot of water, but they cannot drink enough to compensate for the loss of water through the kidneys. Subcutaneous fluids are an excellent way to help keep the toxins flushed out of the bloodstream and make your pet feel much better. (Click here for detailed instructions)

 
 

Holistic Veterinary Care

While no treatment can create new kidney cells when scar tissue has already formed, homeopathy, herbs, flower essences, or acupuncture may be able to help your cat feel better and live a better quality of life. Check out the Americna Holistic Veterinary Medical Association for a directory of holistic veterinary practitioners by state.

It is helpful to reduce stress for any animal with kidney disease. Quality of life is an important consideration when deciding how aggressively to treat any disease. Flower Essences can support your companion emotionally and decrease stress. Flower Essences are completely safe to use along with any conventional or alternative treatment for kidney disease. I recommend the following formulas:

  • Only Natural Pet Just Relax
  • SpiritEssence Graceful Aging
  • Pet Essences Kidney Strengthener

Both Chinese and Western herbs can be useful in the beginning stages of kidney disease. As the disease progresses, consultation with a holistically trained veterinarian is recommended for proper use of appropriate herbal remedies.

Traditional Chinese herbal formulas like Golden Book Teapills, are a classic combination of herbs used to strengthen kidney function.

Acupuncture can be very useful for animals with kidney disease. Regular acupuncture can help slow the progression of the disease, stimulate the kidneys and boost the overall vitality of a dog or cat. To find a practitioner in your area, visit the holistic veterinarian directory.

Helpful Resouces and Links:

Feline CRF Information Center
Holisticat Community
Canine Renal Disease: Danemist – has many helpful links

Additional Resources:

Dr. Pitcairn’s Guide to Natural Health for Dogs and Cats
Veterinarian’s Guide to Natural Remedies for Cats
Veterinarian’s Guide to Natural Remedies for Dogs

 

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The articles and information in the Holistic Healthcare Library are presented for informational purposes only and are not intended as an endorsement of any product. The information is not intended to be a substitute for visits to your local veterinarian. Instead, the content offers the reader information and opinions written by our staff, guest authors, and/or veterinarians concerning animal health issues and animal care products.

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