how close to a house, that is the determining factor, if he is 3 hours from the closest house, i dought its a dog, but 5 min ya prob. now you also have to look at if there is a lot of traffic of people that may bring there dog. it looks like it could be a bad pic of a coug, or just a weird pic of a dog, its hard to say cause its a ass shot of the animal. and well rounded tail looks like cat and the round ears but dogs do not all look the same. the tail also has a curve to it that i don't see in dogs to often.
leaning toward coug, leave the camera out there some more then will tend to be in the area again and looking for that mineral lick