I have noticed 3 reasons why Max eats grass.

1. His tummy is upset & he barfs.
2. His bowels r upset & he will eat so much that all he poops out is intangled grass
3. he likes to nibble on it too.

Max has a barf/pee/poo mat infront of the back door.. if he makes a boo boo he'll do it on the mat cause he knows we'll ast like nothing happened, but he learned a harsh lesson about peeing where ever he likes too last fall.. Dad caught him peeing in the main hall for no reason, so dad fermly shook him by the scruff & he hasn't peed on the floor since.. yay!!