I have a two year old bully mix who spends a lot of time with me. And I always try to devote some snuggle time to him in the evening. We go on runs and play fetch about three times a week. But recently I've noticed a really severe and almost scary change in him. I've been dating someone new and they, my dog and my boyfriend, get along really well. And then I got a promotion at work and Shiro, my dog, and I don't get to spend as much time together as usual. But to the point of this post. In the last three months my dog has started to steal things of mine, typically underwear or socks, sometimes shirts, a couple times my cell phone. And when I try to take it away and reprimand him, usually with a very firm, "No!" he growls at me and in the past three weeks he's even started to lunge at me and just today he bit my wrist. I just need some help about how to deal with this 'new' dog in my home.