I would say Come and Stay are the most important commands.
example there are two dogs in our neighborhood Westie and Jack Russell terrier well the people have them outside off leash without an electric fence. Well there dogs always run out towards people and other dogs and normally get into fights. There jack russell terrier runs around the neighborhood in the street and I have almost run over her because she was in the middle of the road, I am very surprised that she has not gotten hit by a car. About a month ago she ran out and sniffed Polo and then crossed the street and then the school bus went roaring by I was so afraid that she was going to hit and she is not even my dog and the owner was at home calling here but of course the dog paid no attention to her. But there dogs are terribly behaved dogs they sometimes come to there owners when they WANT to. There owners are not very responsible and they have three crazy kids. But my point in all of this is if there dogs knew stay and come it could safe there lives. But since they are not trained they should not be aloud outside with out a leash since it is dangerous getting hit by a car or attacking someone. I just wish the owners would realize that. I know that my yorkies if they are off leash they might not always come back so I never take the chance of letting them off leash unless there are in an inclosed area or on a long leash 20ft or 50ft leash or like in the dog park and they listen when I call them there
