While Timmy mcdevitt was skating to school he saw a golden lab on road with a necklace on. He thought to himself "That necklace looks pretty awesome". So he snuck up to the dog and snatched the necklace not knowing what it would do.
So he brought it to school and read the note that the dog was holding too. When he read it it said. "pick one side for you to join the dog head or the cat's tail and you will transform into any one of that kind, but you will transform..." , and when he got to that point the teacher took it from him not knowing that it said slowly and noticeably.
So later right when he was about to sleep, he flipped the necklace to the dog side and in his dreams, he thought about a dog. Which dog?