Lizbud, Smokey is simply letting you know where he considers you to be the one in complete control and where he thinks there could be a little opening in the leadership stakes! I wouldn't worry about it unless you are having problems in the car or off lead - might be interesting to start insisting on a specific behaviour before letting him have the treat in the situations he usually takes it.....this is very interesting.....you could insist on it for two weeks, without fail, every time and then see if he will still accept it for free after that or if he then sits without being asked.