I know this is an old post, but felt like I should share my 2 cents, I was a RVT for a number of yes and have an AS in vet med as well as food allergy dogs.
I can say first hand food allergies are not as uncommon as you may think. Dogs, unlike people are RARELY allergic to grains, but instead the protein source.
Does this mean that any meat food is bad for allergy dogs? No, but you need a uncommon meat source, I.e. duck, rabbit, etc.
Also, contrary to what many believe, dogs are in fact not carnivores, they are omnivores like humans. Meaning they, like us can be healthy with or without meat.
Feeding a dog a vegetarian diet? I did it with mine for the first 5 years of his life an he thrived on it. He one time got into a friends bag of chicken based dog food and oh boy did he proceed to rip himself up until his legs and stomach were lobster red. I’ll note that he was put on a limited ingredient duck and barley food at age five because after being attacked by a loose dog and suffering head and neck injuries he began having sound induced petite mal seizures and the vet recommended a diet very high in flax seed and fatty acids (which made a significant improvement). Point being he was not take off the veg diet because he was doing poorly on it.
Should you research the vegetarian food brand before starting it? Absolutely. As should you research ANY dog food brand beforehand. There are plenty of non-veg dog foods out there that are lacking in nutrients that your dog needs.
