XD I'm sure he would look very tough in that! I think it would be cute, but the only thing I worry about is people thinking he's vicious or something.
He was chasing kids on their scooters the other day, just chasing them and then stopping a distance away when they stopped. But people around here apparently don't teach their kids about animals. I think the kids were afraid of him, even though I explained that he was nice and just trying to play. When I was a kid I HOPED for stuff like that to happen. If someone saw him running around and they saw a spiked collar, they might judge him even more harshly. :[