Random Dog TF 2

It was my dog's birthday, he was always alone at home, since I'd be at school and my parents would be away at work. I always wanted to get another dog to play with him when I was gone for the day, but my parents would always reply "no another dog would just be more work for us."

Early that morning I went down stairs to give him a nice treat, I fed it to him. He was rubbing up against me, I pet him, I had told him "I really wish I could stay with you, and maybe perhaps be your playmate, but I have to leave" at that very moment he bit my left arm.
I rubbed where he bit since it hurt, but he hadn't growled or did it on accident, like he meant to do it. I could see hairs growing around the bite mark, then I felt hot. I knew something about me wasn't right, so I ran up to my room so my parents couldn't see what was about to happen to me.

My arm began to grow fur around it, my left hand was turning into a paw, the fur started to run up towards my chest. I screamed out in pain as my insides were shifting to their new places. My right hand was turning into a paw and right arm was already covered in fur. My spine felt as if it was getting longer, and looking behind me I saw a tail was growing out from my hind, I could see the room getting bigger, but I was shrinking. My spine had also shifted to where it forced me onto all fours. Soon both my legs were covered in fur and my feet were turning into paws. My nose had turned black, and my face was stretching forward, turning into a muzzle. The top of my head was hurting a lot too, but it was my ears shifting to the top of my head.  

As my shifting was completing itself I, went to the mirror on my closet door, I saw I had turned into a dog. I was glad my parents left early, they wouldn't be able to see me like this. Then my dog walked into my room saying "this was my wish for my birthday, now I finally have a new playmate!" I knew I couldn't stay at home looking like this, so I let me and my dog out of the house and, we ran and played for hours at a park, knowing that now my new best friend had his wish granted...