If they are reacting so excitedly to having the lead out, then the best thing is to have the lead out all the time, and use other 'cue' words to get them ready - no big deal really, they are just so up for it, that it makes you feel a complete heel for making them wait doesn't it !! When you are ready to go, just use another command, like Sit, and make them sit until their lead is on, and then Go !! Unless you are like Bramble, in which case, anyone gets into a car, and he's there in the front seat - no-one goes anywhere if he's not there with them, just in case they stop off at the footy fields or the meadows ... bless !