When we where bell training Chase,at first he didn't ring it.We consistently would tak ehim to the bell,take his paw,ring it,praise him and say outside,then take him out.At first he would go to the door and just look at the door and whine.When he did this we would say ring the bell and you can go out,and we would point to the bell.One,day i hard work and perseverance paid off.Now he goes to the door,and rings the crap outta the bell.If you don't come fast enuff,he just starts ringing it endlessly..Try this method and see if you have success with it as we did..