Benny the Jack Russell Terrier

I have a 2 yearr old Jack Russell named Benny, who is a total mommy's boy but likes to steal my things when I come home from work and run around with them. He used to actually steal things out of my handbag but seems to have grown out of that now, but will eat my lip balm if he can get it.

I have now got a cat from the animal shelter and they tolerate each other, but he gets very territorial when she comes near me and chases her off. He looks all pathetic when I tell him off and tries to look really small and snuggle up to me.