Now even the smallest pet can enjoy a PetSafe underground dog fence.  The receiver is 45% smaller than other fence receivers!  The PetSafe Deluxe Comfort Fit Little Dog Fence was made for little dogs 5 pounds or more. But any dog up to 100 pounds can use this dog fence. The all new PetSafe Deluxe Comfort Fit Little Dog Fence is the only dog fence designed for your small or toy breed dog. A tiny, comfort fit collar it lightweight and small enough to accommodate the smallest dogs. Yet, with 5 Levels of Correction, this dog fence can be used for any dog up to 100 pounds