Pet play―commonly pony, puppy or kitty play― can involve costumes and accessories like tails, cages, collars or leashes, but also can vary in terms of what the sub “gets out” of it. Some may enjoy the aspect of dehumanization and exhibitionism, while others may enjoy letting ‘loose’ and relaxing while their ‘Owner’ strokes or pets them. It is not related to bestiality whatsoever.