As a generalization. I have had shelties for 45 years. It seems to me (in california at least) that the era of breeding for agility has changed shelties a bit. I do love agility but i am not seeing as many shelties with an i want to please you attitude and good at obedience. They seem more reactive/ lower threshold of arousal and it used to be a given that a well bred sheltie was good with kids and other dogs. I keep seeing dogs from big time responsible, long time show breeders with the label “extremely active”. “Best in agility home”. “No kids” “best as only dog”.”too active for pet home”. Even in young dogs. I may be a little scewed in perapective since i adopted a singleton and therefor he is more reactive and i have to keep on him in training or he will regress in certain areas. The good news is i can do that and keep him in his place and especially for a singleton he is wonderful. No trainer ever guessed he was. But it seems some of these traits are getting more common in shelties in california in general without the excuse. There is alot of overlap between breeders so that may contribute. If i get a second dog i need a very easy keeper and just my old fashioned good with kids, reliable, active not hyper, gentle spirited sheltie like the ones i grew up With and my last sheltie. I am not seeing enough of this in the breed to guarantee getting another sheltie in the future. I love my boy and he wasnt a mistake (he was alot of work more so than typical) but i cant do two like this at the same time! Yet it makes me sad not to have another sheltie. And if what i am seeing is the new temperament of shelties in california i dont think i will get another after he passes. I used to only want shelties partially because reliable temperament was a given. I dont get the impression that it is such a given anymore. I am fourth generation sheltie/ collie owner and having a sheltie/ collie is continuing a legacy of generations past. As a note i love doing agility as training and have no issue with the sport in general. My last sheltie had the most reliable temperament and was active and excelled in agility... but i had to stop due to a structural issue. He was evidence they can be both a classic sheltie temperament and agility dog. I just worry breeding for comformation and agility success may have taken some of the focus off temperament. Thoughts? Perspective?