PetSafe® Stubborn Dog Add A Dog® Extra Receiver Collar Collections_Australian Made This mature cat food made This mature cat food made with natural ingredients contains a special blend to help keep older cats agile and more alert With unbeatable taste your cat is sure to be 100% satisfied The collar features 4 levels of static stimulation at a higher intensity especially for stubborn or hard to train dogs This PetSafe® Stubborn Dog In Ground Fence extra receiver collar can be used to add another dog to your PetSafe® In Ground Fence system or as a replacement collar (not compatible with the UltraSmart® and YardMax® systems)