I'm looking to adopt a 5 month old Chow Chow/APBT pup and had a few questions. It is a male and I am concerned that he will begin marking his territory inside the house. He is about 35 pounds and is not fixed. I recently had two chihuahua puppies (one male and one female) that I had to get rid of. During potty training there many accidents of course. Anyways, my question is: Should I be worried about this 5 month old male puppy coming in and wanting to mark wherever he catches a scent of where either of the other puppies has used the bathroom previously?