You're actually serious? What the ****?!?! "He is too mischievous and seems unable to train"...that is NOT a reason to put a dog down. That's ridiculous. And I would hope that any vet you'd go to would tell you the same thing. Why do you even think that? If you can't deal with him, then please for the sake of your dog's life and happiness, contact a rescue to take him in.I may have to put down one friend. He is too mischievous and seems unable to train.
I think most Vets would not put down a healthy dog or pup. They certainly would not put one down for being lively and boisterous like any pup with no training.