I show both conformation and agility. Dabbled in Rally a little. My papillons are fantastic in the agility ring. They are by far the smart ones of the smaller breeds I have had. I also have Chinese Crested Powderpuffs. I only have the coated version. They are super sweet and lovable, great family dogs, but not as blessed in the brain dept as the papillons here. Although I have had a CCPP I bred and sold to a family go on to get numerous titles in obedience. Maybe I sold the smart one!
I have a blue heeler rescue dog, smart and athletic, but very, very intense. Would not recommend that breed for young children, but then again, this is the only heeler I have had.
Also have a Canaan. She is a medium size. She blows everyone away at agility, extremely smart and athletic. Super loving dog, well behaved, but high energy when given the chance. Got her at a horse auction for $6. She was 2, and had her papers, just had her shots, and was spayed. I show her under the name of "6 Dollar Dog".
There are a lot of corgis where I train agility (maybe because its in a horse barn!). They do rather well. I see some mini Aussies too, very cute. There are a couple maltese as well.