This is a fun circle game that has a bit of prank as part of it. Take one camper from the group and explain to him/her that they are going to act like an animal when they return to the group. Explain and that they aim of the game is for everyone else to guess the animal. Then tell them to be a dog for the first round.
While the camper is away from the group, explain to the rest of the group told that they must not guess that the camper is a dog when he/she returns. They can guess any other animals but not dog.
After a few minutes, tell the person in the middle acting like a dog to pick a new animal and then while they are acting as this animal, the campers in the circle keep guessing that they are a dog.