Worked the minute I put them on! I have my freedom and sanity back. Now I can put my call to Caesar Milan on hold… and let me tell you they were sweating from the constant threats. These fools are more than a handful, and to top it off they work each other up esp when they’re on their buddy leash. I had never needed this for my oldest pup so it took me way to long to get these harnesses, but they are game changers. Once they’re adjusted to a fit a bit snuggly they don’t wrap around their torso or allow room to wiggle out or around. It took me a minute and some patience to get them adjusted properly, but once I got them sized they were good to go. Love love. Now I can brag about my perfect angels without a sarcastic snarl on my face. lol