I have a 1-year-old dachshund / Rottweiler dog and he is the best dog in the world, however he pulls a lot and weighs 40 lb so when he pulls it's no fun. I did some research into some different harnesses and I needed something that would fit him since he's kind of a weird build and chat GPT recommended this harness and I am truly amazed by it. The first walk I took him on I literally held the leash by my pinky finger. It's like he never pulled it all and I've now used the harness for everything from walking him through a busy public space to going on hikes and he loves it!! If you have a dog that pulls and is hard to fit, this is the harness for you!!