We tried the bell thingee...
didn't work.. I kept saying " I need a sign to know you have to GO!!" But,, no sign! Eventually, he would go and sit in my line of sight and whine... and One day , I said " Oh theres my sign" ha
So ever since thats what he does,, I just waited him out and he came up with it! Until they do,,, take em out often,,,thats the best way to teach them,,, outside Potty!
Even,if we are going to the car,, we stop and see if he has to pee.. so he knows,,when ya hit the grass ya pee... and he does!