I'm with everyone else. I don't understand why you are wanting a chihuahua, when you already have a pomeranian that doesn't live with you. Why can't you just bring the pom to live with you?

Please DO NOT get a dog from a pet store! They are from puppy mills. I think Petland in particular is known for getting puppy mill dogs.

And YES, they are definitely harder to housebreak! My sister got a westie from a pet store, and he was horrible to potty train. He had no problems going in his crate, and refused to go potty outside.