To be perfectly honest, I was also concerned about the weight difference. BUT, mastiffs are SO gentle (and most of the time lazy couch potatoes)!! I read the thread on here about big dogs and the yorkies, and it seems like a lot of you have big dogs with a little yorkie! That definitely gave me reassurance. My mastiff baby is indoor ONLY. Personally I'd never ever leave a dog outside, especially a mastiff. They are so sensitive and need to be with their family, they'd just be heartbroken if left outside. I was PMing with someone on here who actually does have a mastiff and she gave me a wonderful tip to begin early by teaching a "it's a baby" phrase to initiate a calm nature. I thought this was a great idea. Also, I would never bring in another dog, regardless of it being a yorkie or a different breed, unless my other dog was ready and calm enough to handle a new living thing in the house. The big guy would have to be just perfect with his manners, or else I'd push back the yorkie date until he was ready.
