We just rescued a dog a few weeks ago who was house trained At the rescue. He hasn’t had any accidents in the house. We just took him for Heartworm treatment and since he’s been back, he keeps urinating in the House. Is this a regression thing? Or possibly medication he’s on now? (Prednisone, doxycycline, and transform). I’m not sure what to do, but we have to almost drag him outside and he won’t go. He seems so sad.