Hello, welcome to JustAnswer! I am a licensed veterinarian, and I'll be happy to help you in any way I can.
I have seen a dog who ate so much grass, that it formed a large mass in the stomach, requiring surgery.
so my opinion is that yes, dogs can eat too much grass.
it is indigestible.
small amounts on occasion are no big deal --
but compulsive, repeated grass eating, may be a sign of digestive upset, and a veterinary examination is recommended.
I can't see your reply, so I will change the Q & A into a chat session where we can continue...
He is bloated and becoming lathargic. We are on the road traveling. Is there anything that I can do until I can get him to vet? He is not vomiting the grass but wants to eat it when we get out of car.
you can try a dose of Pepcid-AC, 10 mg every 12 hours
this may help soothe an irritated stomach.
however, if there's no improvement, you need to seek veterinary care before this issue gets worse and potentially becomes life-threatening.
Okay. Thank you
best wishes to you both
He has alot of silava coming out of his mouth. He will drink water but is gagging like he is trying to throw up.
that concerns me greatly, and I do think that you need to seek veterinary care if a dose of Pepcid doesn't help.