I think it varies from dog to dog and also depends on the source for the sound on the program. Sometimes a dog can be making a lot of noise on a TV show and my 2 dogs not even perk an ear, but other times a bark or 2 sends them into a tizzy. What my 2
always respond to is if there is a car horn, braking or other car noises or the beeping sound of a truck backing up... they will run out the doggie door looking for it
