This is the exact reason I am so glad to have moved out of town! We had the same thing, a large supposedly "aggressive" bred dog that can sclae a 6 foot wall...And our city passed an ordinance against dogs on chains!P.S. We did talk to our neighbor and she is really upset about this. She is an older lady that lives by herself except for her mentally disabled grand daughter and she really struggles trying to keep her dogs in her yard. The small ones dig holes and then the bigger ones make the holes bigger so she can't keep up with this. The animal control officer visited her while we were over there and complained that the pit bull was chained up because it was against the law here to have dogs on chains but if he's not chained he jumps the fence and even though he's the sweetest pit bull some may not see that and become frightened just because of his breed.