Bringing an adult dog into your home demands as much
effort from you and the family as does a puppy. Its a
mistake to think that just because the dog is full-grown and
may have been potty trained in one home, that hell just
immediately adjust to your homes elimination schedule,
too.
Thats not realistic. The dog has many adjustments to his
new environment and doesnt instinctively know that you
dont allow peeing on the floor especially his prior owner
didnt mind or didnt seem to care.
Dont make the mistake of assuming that because hes an
adult dog that hell just know what to do. Start with him
as if he were a puppy and gradually teach him the routine
of your homes pet potty schedule.
You probably need to start with crate training or restriction
to a bathroom. Then set a schedule for potty breaks. Adult
dogs are very picky about finding a potty place outside
thats apart from where they play, just as they dont like to
potty near where they sleep or eat.
Help him find that place in your yard or outside when
walking and return him there for subsequent potty breaks.
You have to monitor the potty breaks for several weeks to
learn your dogs elimination patterns.