These beautiful lush grasses are so tempting to our pets! Be careful not to allow them to eat the grass because not only can it cause them to vomit, but it may be treated with a chemical you know nothing about. Cats often will get grass caught in their throat and really be uncomfortable, gagging and even sneezing and vomiting. Dogs love the grass so much they keep eating until they vomit and then they may continue to vomit because it has upset their stomach!