I read somewhere that if your dog has an "accident," put a paper plate with some dog kibble on the spot that he peed, and let him eat it. Dogs won't want to eliminate where they've eaten.

Anyone know if this works?

I'm sure Nebo's just protecting his property. Whenever we visit my parents with our Murphy, their dog Coco (who's 10 years old!) eliminates in the spot where Murphy's bed was. He only does it once, though.