I would swap skunk and raccoon, personally. Skunks shoot liquid at you, and I imagine of the three that the raccoon would be most likely to burn down a building, it if could.
They would evolve into a Fire/Poison skunk with explosive gas, since methane is flammable. I'm aware that skunk spray is actually liquid, but the idea that it isn't is a popular trope that they could do something with.