Cannot recommend the harness. Purchased for our border collie when he was 10 months in size recommended (M). The side harness clip is not sufficient to stay clasped when the dog is active . It keeps coming unclamped.he is now 21 months and about 50 lbs. l waited to write review till he was adult size to be sure . Still comes undone ,have tried readjusting straps numerous times and has not resolved the issue. Contacted Doggy Kingdom by email and after 4 attempts they said to take pictures of harness to show them. ?? What good would that do. The clip is not broken just not sturdy enough to stay clasped. Again totally not satisfied and disappointed with product . User's recommendation: Recommend not purchasing.