Quote:
Originally Posted by Amputate Your Head
The dog is marking his turf, to make sure it's in a place where any threats to his position in the pecking order can pick up his scent. Obviously the dog doesn't realize that babies don't operate the same way other dogs do, but that's most likely what's going on. He's not sick, he's just letting the new arrival to the pack know that he's still got rank. But you must ensure that the dog learns that, no.... he's been demoted and the baby ranks higher. 
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Great point and I would go with this first and approach it as a behavioral problem as opposed to a physical problem.
You said you have a doggy door so I'm assuming the dog went out on his own when he needed to. Perhaps you could MAKE him go before bed time to empty him out plus give him a bit of attention while doing it.
If possible you could close up the utility room and see if he stops or goes somewhere else.
I thinks AMP's on the right track except for the demote the dog thing because after all you can't teach an old dog new tricks. Maybe the dog needs some reassurance and attention to let him know he is still part of the " pack ".