Changing what you can, and living with the rest.
Although there are many on the forums who could respond to this, I think I will give it a try. Shelties are a herding breed. They are hairy and barky, intense and alert, and always super sensitive to their environments and their people. It is in their genes - and that we simply cannot change. Having said that - we can have a grand time brushing/grooming them and making that a time for positive interaction - we can teach them to bark less under certain conditions and help them focus on things they don't need to bark about - once a sheltie is focused on "whatever" it is going to be a challenge to guide them to focus on something else, but it can be done - when a sheltie decides it loves you, you are going to gets lots of doggie affection - when a "danger" noise, smell or sight occurs you are going to hear about it in no uncertain terms, and you can modify that in ways with which you are comfortable. I like to think about it not so much in terms of changing behavior, but rather shaping behavior. I believe that is not just word play. Also, maturity has a lot to do with behavior. My Jake was all of the above when he was two, but by the time he was eight he had mellowed to the point where one might think he was a different dog. The simple fact is that he had learned how to control himself -with our help - and no longer had the need to "demonstrate". He didn't lose behaviors, he just managed them better. To use your example of Sadie getting upset when people seated in a room get up and move around. To her, when her "sheep" are all seated and quiet, she has done her job. When they get up and move around she needs to get them "back to their place". What you need to do is to help her find some other way to "control her sheep" that the "sheep" can live with. Your time with her, even at seven months, is still short. Time and patience, along with a little good doggie psychology, will win the day. Yours aye, Will