I have 7 month, 7 lb male Yorkie. I didn't crate train him and now I can't leave the house without a babysitter. (and then I've seen cats held under a faucet of water fight less) MY QUESTION IS:.. AS I CRATE TRAIN HIM...SLOWLY... will he be OKAY?? or should I get him a companion?? And should I get the Metal kind or the plastic pet carrier variety??