Zero's issues with housebreaking

I'm extremely frustrated...Zero was doing well being housebroken. He had a schedule and I could actually leave him outside of his crate for a few hours by himself and not even worry about him going in the house. Than he goes to daycare for a few days while I'm away at a Con and now it's like he completely forgot how to be housebroken. I figured that his schedule might be a little messed up but if I'm not around he won't go to the back door and bark when he needs to go out. He'll just go on the living room floor.

It's frustrating that a few days away could ruin so many months of work. It's like I have to start back from the basics again. Maybe next time I'll find someone to come to the house and watch him...because this isn't fun. I'd gladly pay them the same amount we pay for daycare if I don't have to deal with re-training my dog every time I go away for a weekend. Right before I left for the Con Zero had just gained the privilege to sleep on the bed at night. Now he's back in the crate at night and he'll have to be there a lot during the day until he snaps back into his routine. I hope that's very soon!

I've got plans to go out on Friday and I wasn't at all worried about leaving him out in the house all day but now he has to stay in his crate while I'm gone and I have to pass on seeing "Inception" to make sure that he gets outside...not at all pleased!