Let me start by saying that I am deeply saddened today, as our 10yr old sheltie passed this morning, we put him down. I am just trying to wrap my mind around why and find some comfort in the decision we made. About 2yrs ago he was diagnosed w/hypothyroid and an autoimmune disorder. He was immediately and on-going placed on thyroid medication and steroid therapy. in the past few weeks he began to become aggressive, had trouble finding a comfortable sleeping place, excessive panting, disoriented, aggression (even towards me), and while at the vet this week he began seizing. His blood work week before last showed high white blood cells and this week after being placed on antiobiotics show higher white blood cells. He had been having skin twitches and extremely dry skin. Just looking for some confirmation that it was the right thing to do.