if it works use it lol a prong would never work with misty(border collie) because she is so focased on pulled that could not care less about pain, I use a halti for her, it works as best as anything is going to lol because when she is in focas mode she will even pull in a haltie, she is just so intensly focased on pulling that she wont pay attention for anything. she wont even look at a peice of liver for petes sake! lol even with general corrections around the house, neither negitive nor positive reinformant will work for her, however if I show her my teeth.. lol she stops immedietly! that is the only thing that works for her. your dog is a border collie to I believe so you gotta choose what works, because most BCs are so focased that you could shock them on high(with a shock collar) and they would not even flinch, so I am not sure what good a prong collar would do with these dogs lol like I said when it comes to BCs if you find something that wokrs, use it lol