we got our 6-mon pup last weekend and he was apparently house trained already, to our delight. except for peeing once that first night, he was great about holding it until he got outside... then the work week came and when we go to work, he put him in an enclosed area... of course, he's not happy about that and puts up a fuss, but monday he did well in keeping with his house training ways. then last night he peed in the house! my husband went home for lunch just now to walk and feed him... had already put him on the lease to go for a walk and he peed!!!! what should i do? what does that mean? i'm afraid he's unhappy because we're leaving him alone for 4-5 hours at a time and he's trying to rebel through this. i know he knows how to hold it in and he didn't have an excessive amount of water or anything last nite or this morning... someone shed some light on this. HELP!!!