Bichon Frises

How in the world does one train a male bischon to stop marking/peeing in the house?! We are four years in and at the end of our rope. When left unattended, even for a very short spell, our 4 yr old male will mark 5-6 times. We use enzymes to clean up. Take him out, for regular walks, etc....Help!

You do not state if your male Bichon is neutered. I have 2 male Bichon's, both of which are fixed. Neither of them mark in the house. Unfixed male dogs will mark in the house. You can get a belly band, which goes around their stomach and stops them from marking. If he is not neutered that would also help alot.