Jill, no the other two don't ring the bells. They just come and look at me and hurry to the door. Usually if Jazz has to go potty, she'll stare at me and then spin in a circle. However, when Keoki rings the bell the other two do run to the door.
I didn't put anything on the bells, just held a treat right above them. When he tried to reach the treat, he hit the bells, was told "good boy!" and got the treat. Then we moved to hit the bell, get praise, door opens, get cookie. Then onto hit the bell, door opens, treat gets tossed outside. NOW we're working on, "Stop ringing the flippin' bells so much!!" LOL
Quercus, I don't want to remove the bells as I reallly don't want to slow this already painfully slow process of house-training. But we are no longer treating for ringing. But we are trying to make it as fun as possible to get outside. So, he rings the bells and one of us goes to the door with a "good boy", and runs outside in the yard with him.
Pat, a hot wire may well work. We had one around the perimeter of the fence about 12 yrs ago because Gypsy would dig out. We disconnected it after we found a few dead birds by it. BUT, birds don't usually sit on the gate that he tries to climb as it just opens into the boat-port area {dh used to have a boat}; That gate stays closed all the time anyway now.
Dh is in San Diego until June 1. I'll see what he thinks when he gets back. My kids are old enough – and it may encourage them to follow the rule of DON'T CLIMB THAT GATE!!!! LOL. I could just turn it off if younger kids come to play.