Bunnies also have levels, and must be level 4 to dance. To level them up, you can feed them Food that you have grown or bought. As you feed your hungry bunnies, there will be another bar at the top. That represents the exp your bunnies has and will rise, but not as quickly as your hunger bar.
One way to get them is to breed with the Dance Floor. A guide of breeding co mbinations: Breeding Guide
For a list of all the bunnies in Tunnel Town, click http://tunneltown.wikia.com/wiki/Category:Bunnies.
Note: We Will soon be listing all the Bunnies here. No need to go to the link.