PetSafe Little Dog Receiver CollarA smaller, lighter collar designed with little dogs in mind. Keep your pet safely contained, comfortably. Little Dog Extra Receiver collar can be used as an additional collar on all PetSafe® In-Ground Fencing systems. Designed especially for small dogs and comes with the smallest QuickFit™ receiver collar that provides a quick release and perfect fit every time. With four levels of correction plus tone only option, and a low battery indicator that flashes when battery gets low and ensures you never get stuck with a dead unit. The additional collar allows you to work with multiple pets.