Animals & nature · 2012
What nutrient balance did dogs choose after getting used to experimental foods, and how did their first choices differ?
After becoming familiar with the experimental foods, adult dogs from 5 breeds chose a diet providing approximately 30% of its energy from protein, 63% from fat and 7% from carbohydrate. The balance was similar across breeds; at first exposure, the same dogs chose slightly less fat. This suggests that learning played a role, but it does not establish an ideal diet: the dogs also ate far more food and energy than expected from their calculated maintenance needs.
Details
The researchers offered adult dogs from 5 breeds different experimental foods to test whether they regulated the balance of protein, fat and carbohydrate they ate. The analysis examined these nutrients together as a dietary balance rather than treating each separately.
After experience with the food combinations, the dogs selected approximately 30% of their energy from protein, 63% from fat and 7% from carbohydrate, with a similar balance across breeds. These are shares of energy, not shares of food weight. The researchers interpreted this balance as a possible dietary target. At first exposure, the same dogs selected a slightly lower proportion of fat, and that difference was statistically significant. This pattern suggests that learning played a role, though the abstract does not establish how that learning occurred.
Choosing a consistent nutrient balance did not mean limiting total intake to estimated needs. The dogs consumed far more food and energy than expected from calculations of the energy needed to maintain their bodies. The findings therefore describe food selection under these experimental conditions, not proof that the chosen balance or amount was healthiest.
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