This is our second purchase from Perfect Fit as we needed to buy one slightly larger harness for our one year old Chihuahua who started wearing her first harness at 12 weeks old. It still fits but we needed the next size up to wear over winter jumpers. I phoned for advice and was talked through the website ordering to make sure I got the correct size. Incredible customer service and so pleased with the 2 new harnesses that arrived very quickly. I now have the ability to wash when they get dirty and still be able to walk everyday in a clean dry harness. The product fits so well and never moves even if my nervous Chi puts the breaks on? I would not waste my money on any other harness 💕