the reason that dogs eat grass is because they NEED the nutrients that grass provides... wayyyyyyyyyyyy back when they were wolves & even early and or rural dogs, they would kill grass eating critters (dear sheep etc.) there was particially digested grasses in the bellies so they got the goodiness that greens provide that way.....

the only reason they throw it back up is because of the sharp slivers that grass has....
if your dog is REALLY munchning on grass... try to give them broccoli or celery or other leafy greens....... there are also products like Barely Dog that help a bunch.

I'm a freak..... I cook for my kids....