Pet owners can be crazy in their choice of species, (the canine world sits well with me), I would draw the line at owning an exotic pet, such as a Proboscis monkey, and if I did, I certainly would not want its snout imprint! (How about a pot bellied pig, a horse, or even your loved one)?
What happens if your canine companion is a huge Mastiff, or some thing of a similar size, would you want to carry 1Ib of semi precious metal around on a key ring, or a pendent on a chain? I guarantee that some one will. As I said earlier, the mind boggles