[Jenn H]

T-dub
Of course food intolerances go away. The aggravating factor has been eliminated.
A dog may be diagnosed with having a food “allergy” to chicken, but if fed chicken from a different source (farm) they may not have any problems.

It’s perfectly fine for a dog to eat animal by-products. Americans tend not to eat this stuff, but other countries do. The by-products can be anything from cartilage to organs. Organs are loaded with good stuff.
Chipmunks, snakes, field mice aren’t considered good enough for human consumption, but my dog will happily eat them when she finds them on the farm. I don’t know if she’s getting much or any nutrients from them, and I wouldn’t eat them, but that’s the difference between humans and animals. She doesn’t like fruit, I do. We’re different. I’m not going to force her to eat something or not based on whether I would or wouldn’t. I feed her what I believe to provide the best possible nutrition for her that helps her thrive and keeps her healthy. And if it happens to be more sustainable than that’s a bonus. (Veganism is not a sustainable option. But that’s a whole other rant.)

Poor breeding is to blame for cancers and degenerative diseases. People will breed anything. They just want to get paid. It’s hard to find breeders who do genetic testing and are careful to keep their breeding stock optimal. Many breed for show. Which if you’ve ever seen the conformation of show dogs will notice how deformed they actually are compared to their healthier ancestors.

I do believe food is the most important part of preventing health problems and sustaining the health of any animal once they are born, but before that breeding only the healthiest must be done.

Many humans do well on vegan diets for a while because they have cut calories, decreased junk food, increased fruits & vegs. Then they don’t feel great because they become malnourished.
Even they supplement what the food is missing they still aren’t getting the best possible source of that nutrient as it’s better to get nutrients from foods than replacing with synthetic versions.
Short term veganism has its benefits (for some humans), but no one can say with certainty that long term benefits for anyone exist.