hi, I'm not a vet, but I know a couple, very well.

They say, don't let them eat grass because:
1. it could have pesticides on it
2. it could have systemic herbicides on it
3. there could be worms, parasites from other wild or domestic animals on it
4. too much grass can cause some animals to have painful (or problematic gas)

Another vet I know noted that some dogs eat grass when they feel sick. They do this to help themselves throw up. You might want to see if that applies to your doggie, in a vet checkup. :)

Next time you're at your vet for a checkup or shots, ask him or her what you should do about grass eating! good luck!

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