Border Collies are smart dogs and don't always learn what you think they are learning. This dog may have learned that when his people are with him, he should ask to go out. But, when his people aren't there, or are asleep, he may not know what to do. You will never retrain him without supervising him any time that he is loose in the house, so you may have to go back to using the crate at night. If it's in your room, you can set your alarm, take him out with no fuss, and just put him back after he's gone outside. When I'm training a dog, I leave a pair of sweats and some muck boots next to the bed;-) The best product I have found for eliminating odor is Petastic. If he was pee'ing in his sleep, I'd say he might have insufficient sphincter control, but if he's doing it while awake, he may just not be able to hold it well, or doesn't realize that the bathroom is outdoors at night, too. Do have him checked for kidney function, though. Sometimes an older dog will be incontinent at certain times because of differences in intake of fluids during the day. That can even happen with normal dogs - my hound can lay on the couch all day, but between six and eight in the evening, he wants out several times.
Regional Director for Massachusetts, International Positive Dog Training Association
Director, SeniorCare Pawsitive Connections Program
AKC CGC Evaluator #3669
Therapy Dogs, Inc. Tester/Observer
Sioux, CGC, TDInc.
Maska, CGC, TDInc.
Sequoyah, CGC
Fergie, Retired Lap Dog, Age 20 1/2
Dancer, CGC, TDInc. (1989-2006) #1 Heart Dog
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"If you talk to the animals they will talk with you and you will know each other. If you do not talk to them you will not know them and what you do not know, you will fear. What one fears, one destroys." - Chief Dan George
"The fidelity of a dog is a precious gift demanding no less binding moral responsibilities than the friendship of a human being. The bond with a true dog is as lasting as the ties of this earth can ever be." ~ Konrad Lorenz