Firstly, despite the "guilty look", he doesn't actually feel guilt. He is, however, offering you an appeasement behavior because he can tell you're mad. Body language, tone, and facial expressions are easily detected by our dogs.
Has he been to the vet to rule out anything medical? If he was fine fine fine and then all of a sudden, not fine, it is worth a vet visit. You'll also need to clean the carpets with an enzyme based cleaner to remove the smell. You can also rent steam cleaners if he has been going everywhere.
If he's cleared medically by the vet, I would go back to potty training 101. Constant supervision and any sign of sniffing = outside to potty. If he pees, throw a big party with lots of treats and praise.
Has he been to the vet to rule out anything medical? If he was fine fine fine and then all of a sudden, not fine, it is worth a vet visit. You'll also need to clean the carpets with an enzyme based cleaner to remove the smell. You can also rent steam cleaners if he has been going everywhere.
If he's cleared medically by the vet, I would go back to potty training 101. Constant supervision and any sign of sniffing = outside to potty. If he pees, throw a big party with lots of treats and praise.