What Is Bioavailability in Dog Food?
5-minute read · Loyal Saints Nutrition Glossary
Quick answer
Bioavailability is the proportion of a nutrient that's actually absorbed and used by the body. A dog food can list high protein on its label, but if that protein is poorly bioavailable, the dog absorbs little of it. Freeze-dried raw protein is highly bioavailable because it isn't denatured by the high heat used to make kibble.
Bioavailability is one of the most important — and most overlooked — concepts in dog nutrition. It refers to how much of a nutrient the body can actually absorb and use, as opposed to how much is simply present in the food. A high number on the guaranteed analysis means little if the nutrient passes through the dog undigested.
Why processing matters
Heat is the key factor for protein. High-temperature processing — like the extrusion used to make kibble (160–200°C) — denatures proteins and can reduce their digestibility and the availability of certain amino acids. Freeze-drying uses no heat, so the protein remains in a more natural, highly bioavailable state. The same is true for many heat-sensitive vitamins and enzymes.
Why ingredient source matters
Source matters too. Animal proteins are generally more bioavailable for dogs than plant proteins, and whole muscle and organ meats are more bioavailable than rendered meals. A food built from whole, human-grade animal proteins and processed without heat delivers more usable nutrition per gram.
What affects bioavailability
Processing temperature
High heat (kibble extrusion) reduces protein digestibility; freeze-drying preserves it.
Protein source
Whole animal proteins are more bioavailable than plant proteins or rendered meals.
Whole food vs. isolates
Nutrients from whole foods come with cofactors that aid absorption.
Why the label number can mislead
'Crude protein' counts total protein, not how much the dog can actually use.
This is central to why Loyal Saints chose freeze-dried raw: it delivers highly bioavailable, whole-food nutrition without the heat damage of kibble. Your dog absorbs and uses more of what they eat — which is why many owners notice better coats, firmer stools, and steadier energy after switching, even at similar 'protein' numbers on paper.
Frequently Asked Questions
What does bioavailability mean in dog food?
Bioavailability is the proportion of a nutrient that's actually absorbed and used by the dog's body, versus simply being present in the food. It's why two foods with the same 'crude protein' number can deliver very different real nutrition — the more bioavailable food provides more usable nutrients.
Why is freeze-dried raw more bioavailable than kibble?
Freeze-drying uses no heat, so proteins, enzymes, and heat-sensitive vitamins remain in their natural, highly usable state. Kibble extrusion uses high heat (160–200°C) that denatures proteins and degrades some nutrients, reducing how much the dog can absorb and use.
Does a high protein number mean a food is better?
Not necessarily. 'Crude protein' on the label measures total protein, not how much is bioavailable. A food with highly bioavailable animal protein can deliver more usable nutrition than one with a higher number from poorly digestible or plant-based protein. Source and processing matter as much as the number.
How do I know if my dog is absorbing their food?
Visible signs of good absorption include firm, modest stools (less waste means more was absorbed), a healthy coat, good energy, and maintenance of healthy weight. Many owners notice smaller, firmer stools after switching to a more bioavailable food like freeze-dried raw.
Now you know what to look for.
Loyal Saints: real whole foods, no fillers, no synthetic premix, complete and balanced. Everything you just learned to want.
