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Coming Up a Bit Short

Sometimes a diet looks complete at first glance, but nutrient calculators reveal deficiencies.

Diet Critique by Mary Straus, published in the Whole Dog Journal, December 2011

This is the debut of what we intend to be a regular feature in WDJ: a detailed critique of a home-prepared diet. I will analyze diets that people feed their dogs and offer feedback and suggestions that might improve the nutritional value of the diet.

Raw, boneless diet for an active 37-lb dog

Bridget Maxwell lives in Glasgow, Scotland. Maxwell feeds a raw, boneless diet to her two dogs: Tara (far right), a lean and very active six-year-old Staffordshire Terrier-cross who weighs 16.9 kg (37 lbs), and Pepi, a moderately active and is and slightly overweight four-year-old Podenco-cross who weighs 15.5 kg (34 lbs).

Both dogs are healthy, but Maxwell has noticed a few problems, including clicking in their joints that started three or four months after she began feeding a homemade diet a year ago. I took a particularly close look at Maxwell’s diet to try to determine what nutrients might be missing or excessive in hopes of resolving this issue.

Here is the diet Maxwell currently feeds her larger dog (the smaller dog gets the same foods in slightly reduced quantities). These amounts are daily totals, split between two meals:

At first glance, this diet looked pretty good, with appropriate proportions of meat, organs, and vegetables, and good variety. It is a little high in fat, with 49 grams of fat per 1,000 calories and 44 percent of calories coming from fat, but that’s okay for a very active dog (feeding less of the beef and lamb might help the smaller dog to lose weight).

Some other initial thoughts: Eggs and fish are missing. Adding starchy foods would help to reduce the fat content. Vegetables would be better digested if pureed in a food processor, blender, or juicer rather than just grated, and the Brussels sprouts and turnips may need more cooking to be digestible (raw vegetables aren’t harmful but don’t provide as much nutritional value as cooked vegetables).

Surprise!

When I entered the diet into a recipe at NutritionData.com and compared it to National Research Council (NRC) recommendations, I was a little surprised to find that it did not provide their recommended daily amounts (RDA) of several nutrients:

If Maxwell failed to add the supplement, the diet would also be very low in vitamin E (1 mg; RDA 8 mg). It would also be low in magnesium if she were using plain calcium or ground eggshell instead of the seaweed calcium (the diet supplies 96 mg, RDA is 164 mg; the Animal Essentials calcium adds 90 mg).

The dietary iron (7.1 mg; RDA 8 mg) and phosphorus (732 mg; RDA 830 mg) are also below recommended amounts. It’s possible this diet is low in iodine (264 mcg RDA), but I could not confirm this, as iodine is not tracked by the USDA Nutrient Database (which is where NutritionData.com gets its information). There is iodine in yogurt and in the Animal Essentials calcium (60 mcg), and this may be adequate.

Vitamin K is also short, but since this vitamin can be synthesized in the intestines, it may not need to be supplied through diet.

Calcium is a little high (1,230 mg; RDA 1,080 mg), due to the amount provided by yogurt.

Also, the number of calories provided by this diet is inadequate to maintain weight for a dog of Tara's size. When I mentioned this to Maxwell and inquired about Tara's weight, Maxwell acknowledged that Tara has been losing weight. Maxwell had calculated the amount to feed based on a percentage of Tara's ideal body weight, but had included the vegetables in the calculations.

Greens and other non-starchy vegetables are low in calories and should not be included when calculating how much to feed your dog. They can be added in whatever quantities are preferred.

Both omega-3 and omega-6 essential fatty acids (EFAs) were high enough to meet NRC recommendations. The diet is a little short in alpha-linolenic acid (ALA), a plant-based form of omega-3, but since dogs don’t utilize this fatty acid very well, I don’t consider that a problem. EPA and DHA, omega-3 EFAs that are found in fish, fish oil, and certain forms of algae, such as spirulina and chorella, are better sources for dogs.

Recommended Changes

Here’s my recommended modified diet for Tara (changes are in bold). Pepi would get 90% of these amounts:

The new diet has about 100 more calories than the original diet, which should be more appropriate for a dog of Tara's size. It meets all NRC nutritional recommendations except choline (158 mg short) and vitamin K (0.3 mg short; 0.4 mg RDA). Choline is considered a member of the B vitamin family and is found in most B-complex supplements, but even those don’t provide enough to meet NRC recommendations. Eggs, liver, beef, salmon, and cauliflower are all considered good sources of choline (choline values in lamb liver are unknown; beef liver has almost twice the choline of chicken liver). Feeding all beef liver rather than half liver and half kidney comes close to meeting NRC choline recommendations. Nupro could be used to provide choline, but it is low in zinc and contains almost no vitamin E. These should be added separately if you replace the multivitamin and mineral supplement with Nupro.

With the multivitamin and mineral supplement, the addition of eggs, sweet potato, and fish are not necessary, but I believe they provide a more well-rounded diet. Eggs add iron, phosphorus, zin,c and choline, though not enough to meet all the RDAs. Feeding fish one day per week provides enough vitamin D to meet NRC recommendations, and also increases choline. Sweet potato and other starchy foods help to reduce fat levels, and increase magnesium and manganese. Fruit, such as bananas, apples, and blueberries), would provide similar benefits with fewer calories.

If the multivitamin is omitted, the revised diet would still be significantly short on magnesium (46 mg, supplied by Animal Essentials calcium), manganese (0.4 mg), zinc (8 mg), vitamin E (5.4 mg), and possibly iodine. If fish is not added to the diet, cod liver oil could be used instead to provide vitamin D.

See Also:

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I regret that I no longer have much time to respond to questions. See my Contact page for more information. My name is Mary Straus and you can email me at either or

   


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