4 year old Shih Tzus

Question
My family and I just took in a 4 year old male Shih Tzus. According to the lady we got him from he was abused as a puppy but then was with the ladies grandmother up until she passed recently. He has a thyroid disease and is on meds for it. But he seems so temperamental. He doesn't bite he just seems really mad at everything. We also have a female lab who's 1 1/2 who was here first and he doesn't let her walk or play or anything. What are we supposed to do with him being so temperamental?

Answer
I wonder if this little shih tzu is in any pain?  Next time he is in for blood work/ thyroid related/ ask the vet to check his hip and knees for any old injuries????
( old breaks that healed poorly).
This kid may have pain and that is why he is so unfriendly.

Good luck

Marie Peppers