3 months or 3 years?
My mother's dog (an adorable mutt who just turned 18) completely ignores my mother Monday through Friday until 4pm. Why? This is when my mother is usually at work. :) If she's home for some reason, then the dog just naps away like usual. She has been this way since she was about 2 years old. So maybe yours is doing the same?
I have several corgis that "hang out" in their crate...can you put his out again? I also have have some that do like the bathroom because of the cooler floor. I do not see this as abnormal:) I have a walk-in closet that one of mine starts in at night also. he must just like it and feel comfortable there.
Corgis can either hate a place (any place) or an area or a room or a crate or they can use a area they consider safe to spend time alone or seek refuge. Most Pembroke Corgis like to spend some part of a day or night on their own in a area they trust. Taylor mainly sleeps in the master room and it is that room that he often seeks to be alone for an hour- especially after sunset - or when he is stressed by fireworks or similar sounds such as thunder. But he dislikes our conservatory because he had that to himself when he was first arrived from the breeder and didn't like the "atmosphere" of it..
How long has he been hiding there? Can you make him leave?
Have you considered he might not be feeling well? If you can't get him to come out and play or if he seems really stuck on staying there and hiding he might have something wrong with him.
Sounds like.. he's made it his safe place. Most dogs, when crate trained use a crate in a similarity as a den "safe place" to retreat to when needing to distress and or relax. Did you keep him in the crate often when at work? Or was he allowed to run the house while you were gone. If allowed to run the place while at work; he might have made this a pattern as a part of his lifestyle... in when he's alone and or was nervous and experiencing anxiety of separation this was his place to retreat and find relief. Do you still have the crate around? It wouldn't hurt to slowly help him find confidence near you and move his crate back into the house near you in a different room (kind of break up his pattern) some puzzle toys near you to break up his train of thought might help him as well. Giving him a chance to re-connect more with you and not so much with his crate.. bringing him out of the bathroom and the "upstairs" mentality. I hope this helps..
It's probably just because that's where he associates his "den" being at. Seanna likes to sleep in the bathroom on the floor because it's cool in there....so maybe he's just hot? Seanna goes off by herself all the time though when she is tired and wants to sleep. (Unless it's bedtime for all of us. Then she bugs me to go upstairs to bed if I'm not up there by 7:30).
Lucky that you had a breeder who could/would answer those questions for you:)
I was going to post last night and ask if perhaps you had decorated for Christmas in this timespan, and that had upset his routine. But I was busy and forgot to post. So I see my hunch was right. :-) Glad you found the answer. I have one who is very bothered by any change in the home (closed doors that are usually open, etc) and will behave oddly if anything is out of sorts, so that was the first thing I thought of.
So glad you figured it out; and it was more simple than you thought. ; ) Have a Merry Christmas.