I love these harnesses, I have 2 pitbulls and they work fantastic! I also run my own dog walking/pet sitting business and almost all of the dogs use these harnesses! I have seen dogs get out of them but not on my watch and I also use a carabiner and attatch it to the dogs collar and to the harness for more security and all works perfect!! I have the pink and purple for my girls and love the colors!
Although I do wish you carried orange for the male pup we are getting since we have chosen that as his color! :)