Dog grooming urination question?

Do you think that the groomer trimming the "private area", and the stomach, and the leg crease where the rear legs meet the body, would make the dog more prone to wetting in the house? This is a one year old Shih-Tzu Bichon mix. I have had him for about 2 months. He was never completely house trained. He was neutered before I got him and still squats to piddle. I had thought he was doing better and it seems like since he got groomed he is worse again. Hard to catch him if he does it during the night. He goes all day in his, rather roomy, crate and does not piddle. He came to us used to sleeping on the foot of the bed so we let it continue. We were able to control evening indoor wetting by limiting the rooms he has access to. At night if he wakes and no one lets him out he may piddle on the carpet. If he gets to go out he may take his own sweet time stepping off the patio and again for coming back!