Anything is possible but I wouldn't worry too much. If he continues or if you see any other symptoms you could give your vet a call and express your concerns. Eating grass/weeds in and of itself is nothing to be too concerned about. I had a rescued Rottweiler that used to eat grass all the time. It sort of became a joke that she was part cow and liked to graze. It was never an issue either. She lived to be 13 which is practically unheard of in Rotties.
If you notice any other "allergic type reactions" give your vet a call.
Oh and by the way, Welcome to the forum.
God bless you for rescuing.
If you notice any other "allergic type reactions" give your vet a call.
Oh and by the way, Welcome to the forum.