Our two year old mixed breed does not clean his private area. He is about 12 lbs. and wiry terrier hair. His penis area has about 1-2 inches of hair growing and sporadically on his belly. When he pees, pee is all left on the hair. He does not bother to locker clean the area. He is bathed regularly and kept clean, but this is a daily problem with pee residue in that area. I have never had a dog ignore his hygiene like this. Is this normal?