Three days ago found my 14 week old white silkie laying listless on the ground with one legg stretch out and stiff. He also had poop stuck to his butt. I took him and cleaned all of it off in warm water then placed him in a secluded place in the run. The next day he was back to his old self with a clean rump. This morning I found him listless again in the corner with pasty butt again. I've seen on here others talk about pasty but but I don't know what to do for him other than clean him up. Help!!!