Cats and dog

The dog will just take over the MH. The cats will hide behind the couch, under a bed, or in a corner. You won't see the cats for a while. They'll become unsociable for a while. Make sure you keep their litter pan clean so they won't retaliate by using a different spot. After a while, they'll adjust. It will probably take a couple weeks. The cats will probably never warm up to the dog, but the will eventually co-exist. Cats will probably hide more. Until they realize they miss sleeping on-top of you in bed at night! After a couple days ... they'll be back after they get over their "snit".