You may notice that your cat vomits shortly after eating grass—he or she is actually doing this on purpose. Cats don't have the necessary enzymes to digest a large amount of grass, which is why it can make them sick.

Do cats always throw up after eating grass?

91% of the time, cats appear in good health before eating grass. 27% of cats vomit frequently after eating grass or other foliage.

Is eating grass bad for cats?

Is it safe for cats to eat grass? When eaten in moderation and providing it hasn't been treated with any pesticides or herbicides, cats eating grass is completely fine. However, if your cat eats grass a lot, it could get stuck inside their nasal chambers and cause them to sneeze excessively.