Prey Structure and the Protein Rotation Debate

Protein variety—or protein rotation—is frequently discussed among dog owners feeding fresh, unprocessed diets, and is typically expressed as cycling between chicken, beef, lamb, fish and other species as a safeguard against perceived nutritional gaps. This concern tends to look at food primarily in terms of chemical composition and nutrient accounting, with little attention given to its physical structure.

But dogs evolved eating whole animals — including bones, organs, blood, connective tissue and fur or feathers — and chewing, tearing and crushing carcasses are biologically meaningful behaviours. Viewed through that lens, nutrients are delivered through the anatomical composition of prey rather than through species diversity across meals. This shifts the focus of the protein-rotation debate: if adequacy is governed primarily by carcass consumption rather than species diversity, rotation becomes a feeding preference rather than a biological requirement.

This perspective is reflected in clinical practice as well. This line of thinking was sharpened during a discussion with veterinary surgeon Dr Tom Lonsdale, a pioneer in the promotion of raw meaty bones feeding. The conversation took place at the South Windsor property on which stands Rawesome Vets, the practice he operated until retirement and Sydney’s long-standing home of raw meaty bones.

Standing in the carpark outside the practice on any given day, you’re likely to see pet parents loading their 4x4s with 10 kg bags of chicken frames — Tom’s medicine of choice for his patients. Along with the basic diet, Tom stresses the need for occasional large raw meaty bones that require extended ripping and tearing, supporting dental cleaning and broader physiological benefits.

In that conversation, Tom noted that many dogs in his clinical experience were fed predominantly chicken frames over extended periods while remaining clinically healthy. He pointed to the ecological parallel of wild dogs consuming a dominant prey species for prolonged stretches, such as can be seen in wolves in Yellowstone whose diet is overwhelmingly elk. The point was that domestic dogs retain wolf-derived feeding adaptations and therefore are biologically suited to carcass consumption rather than processed diets.

Against that ecological backdrop, a simple domestic illustration becomes useful. My exploration of a chicken-based raw meaty bones model emerged from the curiosity of the practical differences for a dog eating whole prey or a dressed carcass. Consider a typical adult dog: healthy, neutered, around 20 kg, and at maintenance energy needs.

The feeding model used is a raw meaty bones approach built around whole supermarket chickens averaging approximately 1.6 kg dressed weight, with skin and bone intact. At maintenance, dogs of this size typically consume the equivalent of roughly 20% of their body weight per week when eating to appetite (approximately 2–3% per day). When fed this way, a dog of this size consumes roughly one whole chicken every three days.

With whole chickens as the structural foundation of the diet, daily macronutrients and most micronutrients would be delivered through muscle, bone, skin and connective tissue. Muscle meat would supply protein and amino acids along with iron and zinc; edible bone would provide calcium and phosphorus; skin and fat would contribute fat and linoleic acid; and connective tissues would deliver collagen and trace nutrients.

What whole chickens do not provide are the head, feet, feathers, most blood, gut contents, and internal organs such as the spleen, lungs and thyroid, along with neck structures including the trachea, all of which would normally be consumed in an intact prey animal. Commercial processing removes these anatomical parts before the carcass reaches the supermarket.

By way of approximating a wild prey carcass, chicken organs such as liver, heart and gizzard can be added. Other parts such as spleen, lung, trachea and thyroid are not usually available for sale and therefore cannot be reintroduced in their original form. However small amounts of other whole foods and table scraps can provide supplementary nutrients and trace elements. Feeding raw meaty bones on bare earth mimics carnivores eating in the wild and introduces an incidental source of minerals.

Items such as sardines and eggs can function in this way, while small amounts of leafy table scraps could also act as a structural analogue for prey gut contents. Adding back chicken feet could partially restore tendons, cartilage and joint material that would otherwise be lost. Such additions may not be necessary, but they would certainly do no harm.

14-Day Chicken-Based Feeding

Days 1–3
Whole chicken #1

Days 4–6
Whole chicken #2
Add ~150 g chicken liver and leafy table scraps on Day 4

Day 7
Fast

Days 8–10
Whole chicken #3

Days 11–13
Whole chicken #4
Add ~100 g hearts/gizzards, 1 raw egg, 1–2 sardines, and 1–2 chicken feet on Day 11

Day 14
Fast

Because nutritional requirements are defined in terms of nutrients and ratios rather than the number of species consumed, protein rotation may not be the most informative way to think about nutritional adequacy. Wild carnivores often rely on a single dominant prey species for extended periods and consume it in carcass form. A supermarket chicken sits along the same biological continuum as raw meaty bones feeding, representing a practical expression of carcass consumption in a domestic setting.

When nutrition is viewed through carcass consumption rather than species rotation, adequacy reflects feeding structure rather than species diversity. Within that context, protein rotation is best understood as a practical feeding strategy rather than a biological requirement. The broader illustration is simple: whole intact prey represents the ideal feeding model for dogs, while raw meaty bones — whether offered with offal and table scraps or not — remain a practical and clinically grounded approximation.

Many thanks to Dr Tom Lonsdale for his feedback and input on this blog post.