[anonymous]

When Should I Switch My Pet To A Senior Diet?

“Although it is a common belief, reduced dietary protein is not beneficial for the healthy older dog or cat. In fact, lower protein diets for older dogs and cats may have negative effects by contributing to muscle loss. Therefore, dogs and cats should not be fed a reduced protein diet just because they are aging. The “optimal” protein level for older dogs and cats, however, is still controversial. Some companies make senior diets with lower protein while others actually make their senior diets with increased protein. Just like there’s no evidence for benefits of a low protein diet, it also is not clear that high protein diets are beneficial or even optimal for seniors.”
Cornell Vet. 1985 Apr;75(2):324-47.
Nutrition and metabolism of the geriatric dog.
Sheffy BE, Williams AJ, Zimmer JF, Ryan GD.
Abstract
Sixteen 10-12-year-old and eight 1-year-old dogs were studied over a two year period to determine comparative differences in physiological response to 4 diets varying in protein content and percentages of energy contributed by protein. The ability of old dogs to utilize nutrients as supplied by these foods was not significantly different from that of young adult dogs. Except for indices of mitogenic stimulation and serum urea nitrogen (SUN) other physiological parameters studied were not affected by the diet fed. Regardless of diet, old dogs had significantly higher serum levels of cholesterol, phosphorus and alkaline phosphatase and had lower indices of mitogenic stimulation than did young dogs.