The contributing reasons may be:

He is a Lhasa Apso, supposedly pure bred, but I believe he has a splash of Poodle in him. I'm aware of how long it takes to house train Lhasa's, having had them all my life.

We live in a condo on 11th floor so he must be taken out. When I was the only one taking him out, I would take him out, within an hour and a half of the same time each day, three times a day. My wife and step-daughter do not believe that has anything to do with house training and went through a period of time where they varied that activity vastly and his reaction was to mess inside, beginning occasionally to often to more inside than out. I took back over, got him back on the three X a day routine and he was fine.

We live in two different places, condo in PHX and home with large yard in MSN, WI. After above incident, we went home to WI where he has spent most of his short life (he's just over two) and I believe he had a few "accidents" but soon got back to normal. There we tend to let him out much more often and for longer periods of time, waiting often until he asks to come back in.

Upon returning to PHX, even on the three times a day routine, he messes inside too often, however with my restriction of three X a day, he got a bit better. I am now out of town in WI and wife reports he is really bad again. Upon me asking, she admitted to taking him out sometimes four times a day.

He is a rescue dog. I found him in a shelter in PHX, the poor little tyke had been left behind in a home, inside in PHX, middle of summer, no electricity (no air conditioning, had to have been way over a 100 degrees in there), food or water when he was found, emaciated and close to death. The people who found him called the owners who acted as if they didn't realize they had left him behind as they were moving out of state. Said they simply could not return to pick him up, would someone please take care of him? Their loss, my BIG gain - most loving creature I've ever met! But he does not like being left at home alone. He's gotten over it in WI, but still barks continuously in condo in PHX until we return...another issue I had gotten him nearly completely over last time we spent time in PHX (about a month ago for about a month).

He is driving us nuts and slowly ruining the white carpet in the condo or when he messes in the WI home, it almost always is on the only really, REALLY expensive rug we have (I don't think he is a connoisseur of fine rugs, but maybe)

What's a Mother to do???