Does your dog chew grass?
My dog crops grass like a cow. He eats it with gusto whenever he encounters it, to the extent that my friends have begun to refer to him, jokingly, as ‘The Ruminant’. This habit of his doesn’t bother me at all, since it seems to have no ill-effects on him whatsoever - although, when I’m standing outside in the cold waiting for him to relieve himself during one of his infrequent small-hours toilet calls (normally his timing is much more considerate), it’s hard not to hop impatiently from foot to foot while he enthusiastically tears out the mandatory five to seven mouthfuls of grass, chews thoroughly, and swallows, instead of just getting on with the task at hand. Unless your dog’s digestion is suffering unwanted upheavals from his grass-eating habit, it’s not really a problem. Dogs have been eating grass since the dawn of time (or at least, of the species) with few ill-effects, aside from the odd bout of vomiting - and really, this is one of those things that seems to bother owners a lot more than their dogs; most dogs, will simply re-ingest the vomitus and go about their day unfazed. Truthfully, nobody really knows why dogs eat grass.