Our Golden Retriever named Taio is 3 years old, but still pulls on a leash. I tried a lot of different accessories and didn't find anything good. But then I put your harness on my dog, and during the walk I thought: “Really? It used to pull heavily, but not now. ” The harness is pretty strong, it's beautifully crafted and fits fabulously, I really like it. The only thing I'd like to ask you is to make more sizes with neck adjustment. I would be grateful if you make this improvement. Thanks!