Hello. I currently have a male chihuahua/daschund, but is more chihuahua. I would like a bigger dog. The animal shelter has a lab and pit/bulldog mix that I like. I'm hesitant to follow through with getting a 2nd dog because of my dog. He is territorial, and i know the bigger dogs could hurt my dog if provoked. Does anyone have any experience with my situation? It would be hard for me to be there and keep them seperate 24/7. I plan to take my dog to the shelter to introduce him to the dogs. Thanks!