Most mammals have generally similar metabolic structures; much of Peat's work is supported by rodent studies. Animals do have different palates and digestive abilities though, with implications (I imagine) for what they should be eating. I have noticed a few interesting things regarding my dog. She will eat honey, maple syrup, and bananas, but not most other fruits (apples, oranges, grapefruit, berries etc.) and sugar sources. At certain times of day she's picky, but is up for offal anytime. I'm curious as to how you folks approach animal nutrition, and I invite you to share your observations, findings, principles etc.