Yard & Park Trainer Add-A-DogÆThe Yard & Park Trainer Add A Dog receiver collar makes it easy to train multiple dogs at the same time using the same remote. Add up to 2 collars, one for each dog, for a total of 3 dogs per system. You can also use it as a replacement collar for your one dog system. Remote not included. This collar is used to replace a collar or add a dog to the PDT00 12470 Yard and Park Remote Trainer system.