Bo is 3 years old and still tends pee, or mark, in the house at night. He is let outside several times throughout the day to do his business. However, at night he still manages to go inside. He used to sleep at the foot of our bed until this issue came up. Now he sleeps in the kitchen so if he pees it's easy to clean up. He doesn't do it every night and it's unpredictable. And because he does it at night and we don't see it, we can't catch him in the act to discipline him. His "sister" a 12 year old German Shepherd was recently laid to rest due to medical issues. Although he still had "accidents" while she was around, is he acting out or trying to reclaim territory? He'd be the perfect dog if we can nip this in the bud. I'm sure I could crate him at night and put an end to this, but I'd rather be able to keep him loose in the house. Any advice/training/tips would be greatly appreciated. So confused and frustrated. Thanks in advance.