We found PerfectFit harnesses several years ago when our beautiful Border Terrier was 11, and wish we'd found them earlier! We kept him in PerfectFit for the rest of his life, they really are what the name says, and you easily can adapt with different pieces as your dog develops and changes. We now have a 1 year Border, and he's been in them since his very first harness. We were lucky to get fitted at a local supplier, but when I wasn't sure if we could find a supplier I rang PerfectFit and was advised I could get help measuring and choosing the right size on a call, great service and product. Highly recommend for boistserous fun loving Border Terriers. Thank you 😊