The PetSafe Elite Little Dog Fence is designed for dogs between 5 and 50 pounds, and works specifically well for dogs under 12 lbs. with neck sizes of 6-16″. The collar that includes the program is the smallest within the industry and weighs best 2 ounces. The correction level has also been lowered within the Elite Little Dog collar making it more appropriate for small dogs. Because the correction level is adjusted on every individual collar, you’ll be able to set the correction on the appropriate level for every of your dogs without reference to size.