It seems so contradictory given their pointy meat-intended teeth but these obligate carnivores can often be found chomping down on an herbivore’s delight.
Some veterinarians have developed a theory that eating grass helps clear out intestinal parasites (nematodes), sort of like a rake for the stomach. Others believe they just like the sweet taste of some moist grass – especially given their propensity to eat fresh spring grass as opposed to dried summer blades.
In general the most commonly accepted reason is it seems to relieve some stomach troubles, parasites or some have even said infections. I could not find any studies in veterinary literature that confirmed or denied this but did find some surveys performed on clients of a veterinary hospital and mention of an ongoing study.
Basically it’s typical, nothing to worry about as long as they aren’t throwing up afterwards (far more common in dogs) and just keep an eye on them. In fact it’s so popular that most big box pet stores and mom and pop shops sell cat grass – grass you can grow year round just for your cat to munch on.
The true danger is if they chow down on a plant that isn’t cat-safe. To consult a list of plants that are toxic to our feline friends, check out the ASPCA’s thorough list.
If It’s Not Cat Safe Then Stay Away
General rule of thumb, if it doesn’t say “cat safe”, don’t bring it inside you house, otherwise let them enjoy a little grazing throughout their day.