My housemate has taken in an adult dog as a pet. A large, black, 8 year old Schnauzer. This has been, so far, upsetting to the cats. The dog chased them first thing. I myself don't know how to handle dogs. My loyalty is to the cats who are now imprisoned either in my bedroom with the door closed or in the garage room. I guess I need to just view it as part of the adventure of life and let go of wanting things to be as they were, or as I would choose were I living alone.