Horatio

Me and my lovely brother were thinking about Horatio ,Elek's pet, and we thought that he could be some kind of lizard that turns into a tiger-sized dragon. Ratio can breath fire but it is like a cold fire that can turn into ice and fire at his will. It also only spreads as far as he wants it to. We haven't figured out a color or what kind of lizard yet, but he is helping me brainstorm.

As we were thinking of what animal Ratio would be before he turned into a dragon, my brother (lets say his name is J.W.) said, "How 'bout a hamster! And his fur could like, meld into its scales. But wait. Then he would be turning from a mammal to a reptile."
If you would like to leave some suggestions feel free to.