You should watch your dog carefully to work out whether they are comfortable with their leash or not. If they are relaxed, it is less likely that they will be trying to pull away from you while wearing it. Gauge your dog’s reaction when you first show the leash to them. If they cower away or run off entirely, this is obviously not a good sign. Also, if they regularly try to bite it off, this is also a common signal that they are in distress.