I feel so bad for that little puppy. First he was abandoned and now he's being isolated by his new owners. Dogs are social creatures, especially as puppies, that is the time to care and love them as much as you can. I hate this. I'm not the type to call the authorities on you, because I believe in personal autonomy, but still, this is one of the more heartbreaking things you've done.
The pup can't be older than a few months, if that, and the poor little thing is destined for a life sitting outdoors, where his owners will feed him every few hours and go back inside.
Changing the subject back because this is so important. I can confirm this. My next-door neighbors simply bought a doghouse, tied their dog up, only went out twice to feed her, and just left her to her own devices for eight years. She looked absolutely miserable, and it went on for eight years before a neighbor tipped the authorities and the dog got taken away for neglect.
Please, the very least you can do is get the pup a companion. Dogs do not do well in isolation.
