Our two dogs both eat grass when we are out and also on our property. In fact my dad and I call them our sheep because they eat so much grass.

I read that it cleans them out when they need too clean out their system.

OUR last golden retriever would eat it and then throw it all up.

Cats need it and in fact they say if you have inside cats, you should grow grass for them to nibble on. Maybe that is why cats go after plants inside and eat them.