The Ballard neighborhood man, who asked to be identified only as Joel, said the thief apparently squeezed through the backyard door for his dog, Macy, while no one was home on a recent afternoon, KOMO-TV, Seattle, reported Monday.
Joel said police couldn't find any sign of forced entry and determined the dog door was the most likely mode of entry.
"They didn't come through any of the windows or doors, and so the dog door is the only other opening in the house," Joel said. "It's not big -- so it has to be somebody relatively small and willing to scrunch through the hole."
"They had taken our laptops and our iPad and Kindle and some jewelry," the homeowner said of the thief or thieves.
Police were investigating the incident.