We all know that our pets love to eat human food whenever they get the chance, and while certain foods are actually good for their health, like blueberries and cantaloupe, some can make them very sick or even put their lives in danger. But why are there foods that we can eat that our four-legged friends can’t?

As Dr. Whitney Miller, chief veterinarian at Petco, says, humans evolved differently than cats and dogs, which means we developed different diets and ways of processing food. “From our gastrointestinal makeup to our teeth, we are designed to be omnivores with a rich and complex diet,” she says. “Additionally, our bodies can flush out many toxins that other animals do not have the capability to process.”

To discover some of the foods you likely have at home right now that aren’t safe for your pets, read through this helpful list.