Dogs eat grass to settle their stomach and for boredom or because they like the taste of the grass.
Most times when a dog is eating grass it's usually because of the dog having an upset stomach.
The grass helps the dog throw up so that is one reason they eat the grass and when they throw up they get rid of the bad stuff in their stomach which then leads to a settled stomach.
Grass will not hurt a dog when they eat the grass.
That is as long as the grass the dog is eating contains no fertilizer or other weed killer.
As long as the grass contains no fertilizer or weed killer the grass is very safe for your dog to eat.
Dogs sometimes eat grass to settle an upset stomach so when your dog is eating grass they may have an upset stomach.
When they eat the grass it helps the dog throw up to relieve the dogs upset stomach.
Some dogs may also eat grass just because they are bored as well.
But there's no harm in a dog eating grass.
Dogs have eaten grass for many years and never had any health issues as a result.