01/02/2026
Great article Dr C
CHECK OUT THIS PHD ON THE IMPORTANCE OF ANIMAL FIBRE...
We are all guilty of applying human nutritional research to dogs, because in many areas it absolutley applies. However, in some areas, the application of omnivore principles to a carnivore do not cut the mustard. Plant fibre is one of these areas.
Studies in cheetahs show us that "animal fibre", the more indigestible parts of prey, including hair, hide, fur, feathers, skin, bone collagen, connective tissue, keratin, elastin, bone material, etc, is important / vital to the digestive health of big cats.
Then, in 2024, D’Hooghe verified the same effect in domestic cats. Her PhD was entitled "The feline carnivore and their prey: how important is animal fibre and its structure in their diet?". You can find it online.
www.hdl.handle. net/1854/LU-01J99R153EHD7K5KW4DB76JGZ8
She defines animal fibre as poorly digestible nitrogen-rich tissues (fur, feathers, skin, bone collagen, connective tissue, keratin, elastin, bone material, etc) and evaluates its effects on digestion, fermentation, stool quality, and microbiome activity in the cat.
Her experiments reveal:
1. Animal fibre lowered harmful fermentation metabolites in cats
2. Including animal fibre ingredients resulted in a more beneficial short-chain fatty acid (SCFA) balance in the bat, including a higher acetate : propionate ratio
3. Animal fibre improved stool quality and faecal structure in the cats, increasing faecal bulk, producing firmer, more consistent stools and resulting in reduced stool variability (including less episodes of diarrhoea).
4. Animal fibre resulted in better regulation of gut motility and transit, boosting colonic distension (triggering peristalsis) and normalising passage rate and stool regularity
5. Also, animal fibre promoted a more stable microbial ecosystem consistent with wild-type carnivore microbiomes, likely explaining the lower toxin load and improved fermentation pattern seen in whole-prey feeding models.
6. Finally, D’Hooghe emphasises that animal fibre’s three-dimensional protein-keratin-collagen matrix. The net result is it persists longer in the gut, providing better mechanical stool scaffolding and delivering slower, steadier microbial fermentation.
In this way, D’Hooghe shows us that while animal fibre may appear different to plant fibre (one is made of tough meat protein, the other of tough plant carbs), what matters is not their origin but their function to the digestive health of the animal in question.
If fibre is important because it adds necessary bulk to the stool, stimulating motility, and shaping stool, and if its also "vita" for the gut flora, creating fatty acids etc, then fur, feathers, cartilage, connective tissue, and bone matrix do that just fine, at least in cats.
This is why my fibre talk concludes that fibre should be defined by function, not by source.
And all this is before you consider the proven DOWN SIDES of plant fibre in the diet, including aggravating diseases such as constipation, IBD and bloat, not to mention the fact the dogs / cat's rapid digestive system does not need to be "slowed down" by plant fibre. In fact, studies show plant fibre binds their taurine-conjugated bile, resulting in nutritional deficiencies, not least of all taurine, a major risk factor for DCM in meat eaters.
***
If you like this, you're going to LOVE my FREE 3hr lecture on plant v animal fibre...link in comments!