This doesn't mean they tolerate it all though.In fact, nearly one in five dogs has an adverse reaction to its food, according to Jana Hoger, an animal psychologist specializing in dogs, and a pet ...

"My dog, specifically at nighttime, will randomly growl... I was just petting her gently, and she growled. Other nights, we will just simply move, and she will be lying in her crate, and she'll growl.

Pain or discomfort: If your dog shows signs of discomfort when you touch their belly, such as whining, growling, or flinching ...