There is a beauty in the neighborhood where I work who is half Aussie, half JRT.

She looks like a smooth-coated Aussie, shrunk! She's got those pretty blue eyes, a blue-ticked coat, and a JRT personality. She's no more than shin-high, but wants to take on GSDs, huge Labs, anyone bigger. And I haven't actually petted her - she's a nipper! And quick about it - fortunately, I'm faster, and explained to her owner, it's okay, I've been nipped by bigger!