could use some ideas on a calf that has learned to slip his rope halter off, tied low, high or however, this calf rubs against anything and gets it over his left ear then works till he slips out. we've tied him high, low, ever which way and then sit there and watch him within 10 minutes, he's free. I've gone over and popped him on the nose when he starts - didn't help - he just waits till I walk away. we've started using a neck tie when he's tied up. there's got to be something we can fix or tie under the chin to keep that from slipping over his ear - any suggestions?