I have an 8month old Chocolate Lab who up until last week was totally house trained. However the last week or so he had been soiling in his crate of a night. He gets exercised twice daily for over an hour at a time. He has his meals at the same time everyday and he rarely has treats or titbit's. He goes in crate at roughly 11pm. (He has another quick 10 min walk prior to this where he does do his business) we get up between 8-9am this has not been a problem for last 2-3 months I even got up at 6.30am and he has still messed his crate. Any ideas pls. He is not doing it during day. He hasn't eaten anything different and doesn't appear to have an upset tum.