Looking for smaller sport-dog suggestions

I say JRT If you were careful you could get one that does well in group settings. Kaiden would have made a kick butt height dog. He is almost 13.5 inches tall, fast and great with people and other dogs. Not all lines are DR/DA.

Hmm... too much fur/potential for too much barking with a sheltie?
Corgi not quite athletic enough for you?

You need a mini-Luce

I'd be a bit surprised to see one with the kind of drive for toys I see in flyball dogs. Medley was never super into toys, and the Bedlingtons I see at agility trials are far from "high drive, go go" dogs. Granted, I know how much of that is training. I admit, it just surprises me to see them on a list of flyball prospects.

Are you specifically looking for a breeder dog? The only reason I ask is that I've seen quite a collection of drivey small dogs come through rescue over the years. I suspect most if not all have some terrier in them, but I think if you are willing to do a young adult especially, you can get a lot of very cool sport dogs who someone got as a small pet and went "Oh my lord what did I get" when they realized how high energy they were.

I was actually thinking mini aussie. They're not uncommon in rescues around here, I think they're becomming more popular so more are in rescues. I've met several REALLY cool little minis in agility.

I'm not so concerned with the DR/DA stuff as the generalized terrier prey-drive murder cats in the backyard stuff.

The Silky Terrier, or "Silky," is an energetic, curious, happy, busy, self-assured and loving dog who bonds every strongly with his owner and family. He loves attention and craves your companionship, and he wants to go everywhere and do everything with you. When bored or ignored he becomes mischievous! He is a spunky, high-energy dog who is affectionate but doesn't necessarily like to cuddle or be fussed over. He prefers to romp and play with you, and loves ball games and chances to run and play outdoors. He has a great deal of stamina, and needs brisk, daily walks. When outside, he should always be leashed or in a safely fenced area, as he has very strong chase instincts and will run away after small animals. He makes an excellent watchdog because he is alert, suspicious, and intensely protective of his family and territory, and has a very keen sense of hearing. He will warn you with loud, high-pitched barks when he hears or sees something unusual. He will be barky and standoffish with strangers at first, then after a short while grow comfortable with them. He loves to go out into the world and makes a very good traveling companion. He is easy to train and a quick learner, although he may occasionally be obstinate, and doesn't always obey you. He can be difficult to housebreak. He needs firm and patient training with lots of love, praise and rewards. He is not good with small pets; he is much better at catching rodents than living with them! He can live with a cat if he is raised with it as a puppy. He gets along well with older, well-behaved children, but may not do well with those who are too young and rough with him. He basically doesn't shed, and so would be a good pet if you are a clean-freak.

Mudi - spendy and seizures
PyrShep - maybe bigger than I want? BARKY
flyball mix - so much variety and hard to get one from a breeder I'd want to get one from, but maybe. Variable in the prey drive department and the terrierness department.
Miniature Poodle - probably not enough drive to make me happy, but they're still shortlisted and I have my eye on a breeder (songbird) who has produced OTCh and MACH dogs
Bedlington - this is based solely on one dog in our agility class who is freaking AWESOME and I love him. I have no idea how he is as a representative of the breed. I think they're kind of funny looking but I could get over this.

Thoughts? Suggestions? Corrections to my vibes on the above breeds?