Our Golden Retriever named Taiou is 3 y.o. but still he pulls on a leash, whatever we try we can't find anything good. But here we tried your harness and while our walking and I thought: "Really? He's been pulling strongly previously, and now he doesn't." The harness is quite sturdy, sits nice, I like it very much. The one thing I'd like to ask you, produce more sizes for the neck adjusting. I will appreciate if you make this improvement. Thank you!