By Beth Taylor and Steve Brown

One of three dogs will die of cancer. Perhaps, one of the contributing factors to the cancer epidemic in dogs and cats is that they are not consuming enough vitamin E. And, the vitamin E they do consume is not the complete form of it either.

This is an easy situation to correct, however. Giving our dogs and cats real foods high in all forms of vitamin E may help reduce the incidence of cancer, and debilitating diseases like allergies and arthritis.

Vitamin E is comprised of two groups of molecules -- tocopherols and tocotrienols -- each with four forms (alpha-, beta-, gamma- and delta-tocopherol, and alpha-, beta-, gamma- and delta-tocotrienol). Each form also has its own potency and functional use in the body.

Research is beginning to focus on specific tocopherols and tocotrienols, rather than on just vitamin E. New studies suggest vitamin E should be consumed in the broader family of mixed tocopherols and tocotrienols.

However, the vitamin E most often used in pet foods is the alpha-tocopherol form. This specific tocopherol has incredible antioxidant benefits though, as Dr. Mercola has reported, gamma-tocopherol seems to be the only form of vitamin E that actually inhibits the proliferation of cancer cells.

A few years ago, the U.S. Department of Agriculture nutrient database listed just the amount of alpha tocopherol or alpha tocopherol equivalents in food. Now, this data base lists the four different tocopherols for many foods, but does not yet list tocotrienols. ¹

Vitamin E in Pet Foods

Unlike people, who get most of their vitamin E from foods, most dogs and cats get almost all their vitamin E from what's added to pet foods. Pet food regulators consider only alpha tocopherol as a form of vitamin E. You can be sure that with most pet foods, the "vitamin E supplement" is only alpha (although many companies may use mixed tocopherols to preserve the fat in the food).

Pet food regulators recommend a minimum of 14 IUs of alpha tocopherol for every 1,000 kcals (calories) of food. ² A typical 50-pound dog requires about 1,000 calories per day. The vitamin E is there when the manufacturer produces the dry or frozen foods.

That does not mean 14 IUs of vitamin E will be in the food when you feed it to your dog or cat, however.

Vitamin E degrades quickly once you open a bag of dry pet food. The vitamin E in frozen foods also degrades significantly too. Studies we've seen show the processing and storage of foods can result in substantial tocopherol losses, with 70 percent of the tocopherols lost after one month of storage at room temperature, and 60 percent after one month of storage in the freezer. ³ (See our article about storing pet food for more information.)

It's important to add vitamin E in its whole form -- from a variety of whole foods -- to your animal's food. We recommend adding a variety of nuts and seeds, finely chopped vegetables or raw or lightly cooked eggs (see Dr. Mercola's recent article on eggs and biotin) to your pet's diet.

Don't Forget The Nuts

The requirement of vitamin E is conditional with the selenium content of the diet: The more selenium, the less one needs to add vitamin E. Adding a Brazil nut provides both a good source of vitamin E and selenium. For gamma tocopherols, we recommend adding crushed walnuts and pecans, and for the tocotrienols, crushed sunflower seeds.

One nut or a few seeds per day for a 50-pound dog is sufficient. Buy a small quantity of mixed raw nuts, preferably organic, and crush one per day.

Also, rotate the nuts: One day a Brazil, the next a pecan, then a walnut, and then a few sunflower seeds. For smaller dogs and cats, give a nut or a few seeds every other or every third day.

Because spinach has one of the highest vitamin E to calorie ratios, it's also a good source of vitamin E and selenium for overweight dogs and cats. Juice or finely chop a small amount of spinach once per week. Since spinach is high in oxalates, dogs and cats with oxalate crystals should not eat spinach. You can also add juiced broccoli, romaine lettuce (high in gamma tocopherols) and other vegetables up to 1 cup per day for a 50-pound dog.

A crushed broccoli stalk is ideal. For 32 calories, you can add 3.3 micrograms of selenium, 0.78 mg of alpha tocopherol and .17 mg of gamma tocopherol.

Raw eggs, (the whites can be cooked) provide a full range of vitamin E and selenium. We recommend feeding high omega-3 content eggs. For a 50-pound dog, an egg every three days is ideal. A typical egg provides 1 mg of alpha tocopherol and .5 mg of gamma tocopherol, a great addition to your pet's diet!

Many readers of this Web site add fish oil to their own diets, and may add fish or fish oil to their pet's food too. We recommend this too, but only if the proper fish oil is added (fish oil with vitamin E like what's contained in Carlson's Fish Oil) or if you add other vitamin E sources to your pet's diet. The more polyunsaturated fats you feed your dog, the more vitamin E she will need.

If you're adding vitamin E from a full-spectrum supplement, we recommend adding 1-2 mg for every 10 pounds the dog weighs (1-2 mg per day for cats). If your dog consumes a lot of polyunsaturated fats (flax or fish oil), 2 mg for every 10 pounds may be best.