Very interesting. I also understood that it was because dogs don't eat raw bones anymore.
When I was young and our dogs' poo was white, I never really paid attention to it. And when I got Cash and his poo didn't do the same, I didn't even connect the dots. I was feeding him Science Diet because our vet recommended it. At one point, he had bloody diarrhea and I took him to the vet. They never mentioned any connection with his food. That's why I will never trust a vet to know about nutrition.
All Cash's eating problems went away when I started home-cooking, but I didn't really like home-cooking with lots of starches. I was working out of Dr. Pitcairn's Complete Guide to Natural Health for Dogs & Cats and the dogs were very healthy, but the food was smelly and messy (and it took a lot of effort to make it) and their stools were horrible.
With BARF, we have small white poos!

And they don't smell

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