Boy do I know what you are dealing with. My Blaze peed in his kennel overnite. We have had several accidents on the floor, even though he was only on 1 pred a day. Just took him to the vet again yesterday because the hot spot was worse. They gave us a antibiodic and more pred.
Now I have to give him a bath and clean the kennel. We have been trying to take him out every hour.
I think it takes a little while for the side effects of pred. to wear off.
Good Luck