Merlin's Acting Weird....

First thing I would do is in his mouth and look at his teeth.
Hopefully he has not swallowed something that is hurting his belly....
How old is Merlin now, I sure hate this for Merlin and you nothing can hurt as bad as watching a friend hurt brother.. We know he needs to drink, Pain in his mouth ot throat or a damaged tooth will send an animal in a daze of pain... Prayers for my friend Merlin and you.. Will he let you give him a belly rub ? watch our friend close Joe