My boston was a bit a of pill to house train. The leashing him to me I picked up from teh Monks of new skeet, training books. That was huge with this bugger, I had never had quite the piddler that he was. He truly took six months to be fully trained, but pretty much mostly in a few weeks. The few accidents after he got the door was me not getting to to the door in time when he barked to go out.
The treats really got his attention and he will potty in pretty much a down pour to get one.
Good luck and you might try asking someone that works in rescue for some advice, since they deal with retraining dogs, you may get some additional support. I have not worked with a dog that was older.
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