Did you ever scold him for mistakes when he was being housetrained? If so, he may have learned that it isn't ok to "go" in front of you, so he may be holding it when you take him out to potty. I agree with going back to housetraining 101, but I would bite the bullet and crate him for a little while. In the morning, you can take him out and wait till he goes, then reward him with some praise and a tidbit. (Be sure to wait until he finishes, some dogs learn that they can get the treat by stopping in midstream or mid-poop LOL). If, after you go that route, your dog is still defecating in the home at night, it could be that his feeding schedule needs to be adjusted so that he has more urge in the daytime, rather than at night. Be sure to clean up any areas that he might be tempted to return to with an enzymatic product like Petastic.
Regional Director for Massachusetts, International Positive Dog Training Association
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Fergie, Retired Lap Dog, Age 20 1/2
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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