We live next door to a Staffordshire Bull Terrier and Scooter likes to "fence fight" with him. The dog could make mincemeat of Scooter and probably would if he ever got the chance. I run outside everytime I hear Scooter start his "I'll hurt you" barking at the fence and I make him come inside. I do worry about that dog somehow getting through the fence but I know he can't because it's a very sturdy wooden structure and his owners have buried metal sheeting under the fence so he can't dig under it. Still it bothers me to hear Scooter thinking he's so tough.