I had a bark collar here I swore by, one of the lads off here had a Bull X, big stubborn fecker would not shut up in the kennel for love nor money.
Put the collar on him in my kennels while he came in for a coffee, 3 good barks followed by 3 better yelps, the big fecker never made another noise in the kennel whilst wearing the collar, anything with a brain soon begins to realise I bark I get zapped....................happy days