Let's be honest. Even after all the trouble of getting measurements, the harness could occasionally still appear a bit off. There are a few indicators; nevertheless, that could help you determine if your harness is the appropriate size. Your harness may be too tight if you notice any signs of irritation or loose fur in the vicinity of the harness. On the other hand, if your dog is wriggling free or the rear portion of your harness swings to the sides, your harness may be too loose.