My Dog was Hit by a Car- behavior changes

[rdouglass]

Our beagle shauzer mix was hit by a car 1 week ago- he under went major surgery to fix his broken vertabre. He is home and recovering but i am noticing that his personality is different- I am concerned that we put a lot of money into our loving pet and he seems so angry. He is on 3 different meds and of course in his crate most of the time. I brought our other pet in see him, thinking it would make him happy and he was mad at her- growling, snapping and he has always loved her. They were the best buddies. Also, this guy is only 7 months and even before the car accident he was sometimes aggressive with growling when he would be sleeping and we tried to move him, but we were always able to be firm with him and he would stop. Now, its way worse! it's growling, snapping at a new level. I don't know if it's fear of the pain, the meds or what but i want my fun carefree guy back and our other dog is so sad. Any help out there?