For Astibus CAO girl and others little advice::::: " have heavy duty collars and paid close to $600 dollars for them and my dogs have an amazing recall now with or without the collars on. " Something is wrong here ! Do you love your dogs ? If you love them than you don't hit them with electric !!! Do you hit your boyfriend or girl friend whom you love with that ?? For another guy Astibus did you ever asked yourself :Why my dog trying to run away of me ??? There must be a reason, They need to feel your back yard like their own and then they won't be running away!