Depending upon formulation, dog food has a more variable — and sometimes larger — environmental pawprint than human diets.

Anthea Levi is a registered dietitian (RD) and reporter with more than 6 years of experience writing for major health outlets including Health magazine, BuzzFeed, Eat This, Not That!, and Livestrong.

According to the American Kennel Club, seeing the dog twitching, slurping, or even moving his legs are all common indicators ...