All I can say is that I don't understand why a collar is required if a yard is fenced and dogs are trained and all holes are properly reinforced. And of course now the points Limey and I stated seemed moot if we're not talking about a shock collar at all.
People really empathised with Jan when she spoke about being scared when walking her little dog and a dog ran at them. Why was it considered funny that this dog was perhaps running around the street? Because it looks cute? I've seen friendly dogs come close to knocking an elderly person with a walking stick over - not because they are attacking, but because they are loose on the street and over exuberant.
And if a collar was available why wasn't it being used? Never mind, a rhetorical question.
Nothing replaces personal training or training classes *in my opinion*.
Have a nice weekend folks.