I do not know Siri, but in my opinion, MOST Terriers have the sort of edge I'm talking about. With a side of brat-opinion to boot. Terriers are pretty kickin' dogs!
Staffy is on the list as well but I KNOW NO Staffies that are doing agility - all that I know are doing Flyball and that's where their pups go. I'm also aware of some SSA/DA that can happen there, but for the ones I know, not a problem. HOWEVER, I despise their coat. I hate non-double coated dogs, their hair doesn't ball up into the corners so I can just pick them up, I would have to actually SWEEP :yikes: lol
The perfect rescue Pittie is also an option...my friend just got an AMAZING dog out of rescue...but I also really want a puppy so I can do all the fun formative puppy stuff...and puppies are such a crapshoot!