For me it was Agility first then a Sheltie.
Before anyone jumps all over me about choosing a Sheltie specifically for agility, that was definitely not the case.
I lost my Malamute nearly a year before I started looking for another dog. (We still had Melody who was 14 at the time.) During that year, I started watching agility competitions on Animal Planet and thought it looked like a LOT of fun. I also loved the look of joy on the dog's faces when they looked at their handlers. I wanted that sort of relationship with my next dog.
I took the time to research many different breeds and the sport of agility. I knew just about any dog could participate in agility but, I'll be honest, I wanted a breed that had more aptitude for the sport than others - basically, a better chance of WANTING TO and ENJOYING the sport. Having a high drive, super fast, championship level dog was NEVER my goal - just one that would enjoy running the courses with me.
However, the dog also had to have traits that fit with our lifestyle and, of course, have a better chance of going easy on Mel. I eliminated some breeds from consideration quickly because of the activity level or 'possessive' behavior based on those reasons.
The breed I chose had to be a family dog first and an agility dog second.
It came down to choosing between the American Eskimo Dog and the Sheltie. As luck would have it, our local kennel club's dog show was happening during our search and they were hosting an agility trial as part of the event. This gave me an opportunity to talk to people who owned both the Eskie and the Sheltie AND participated in agility. I could also talk to some breeders.
What finally settled me on the Sheltie was the higher chance of the Eskie having a stand-offish personality like Mel. I wanted a dog that wanted to be WITH the family. So, our search for a Sheltie started.
So, yes, interest in agility first then the Sheltie... BUT the Sheltie for reasons OTHER than agility. I believe I selected a Sheltie for all the right reasons - family and agility.