"Sure, why the hell not." He hefted himself back up on all four paws, head tilting as he considered Sam, with a vague hint of doggy grin. "Curious what sort of dog you'd wind up as anyways."

"You know I feel like I should reevaluate my life because that's not the first time someone's made that kind of threat..." Without preamble he hopped back down onto the ground, turning around to face Sam once he'd gotten a foot or so back. "But fuck it. This won't hurt, the spell's good like that, but it willitch like fuck fair warning."

And Sam's questions about how he might do magic? Answered when Stephen's tail started glowing green before it was being whipped in his direction. And true to his word, there was no pain, but when bones started shifting? It would indeed itch like hell. At least it would only take a few moments for the shift to happen once the magic takes hold.