Does your dog graze on grass like a backyard cow? You’re not alone—and in most cases, it’s totally normal. Veterinary experts say dogs eat grass for a variety of reasons, from instinct and taste to boredom or digestive aid. While the habit is usually harmless, there are times it can signal something more serious. Here’s what the pros want you to know about grass-eating behavior and when it’s time to call your vet.