2AM Saturday morning our Great Dane started barking aggressively. He does not bark at night. My husband noticed his mountain bike was not in the AZ room. He let the dog out and he ran to the east fence. The bike was on the fence near the gate, like someone was trying to get it out of the yard to the front of the house. My husband called off the dog and he saw a flashlight turn off in the neighbor's yard. Called police, they responded immediately, could not find the burglar (they checked both yards). Dusted the bike and got prints.