Used playpens make a great place for your small pet to have their litter. My sister's Chihuahua had puppies a few months ago and she wanted her momma dog to have a safe place to have them and to keep the pups away from the daddy dog and cats in the house.
She cut a small hole big enough for the cord to a heating pad to use for the puppies when "momma" needed a break. Also, another good idea is you can drape stuff on the sides for privacy so the momma dog doesn't get to nervous with the other pets looking in.
By Sarah from Chattanooga, TN