The only one I know of is an extremely sweet dog that loves EVERYONE. She is however, one of the most high energy dogs I have ever met - and my last dog was a Border collie. Her mom brings her for day camp at least once a week. She's 3yo now. When she was a puppy, she came 4 days a week or she was a holy terror.
She can get snippy with toy sized dogs if they get to running around too much, but she plays well with dogs her size or bigger. I assume the size = some kind of rodent in her little brain.
She's a great dog and I think she'd do really well living on a farm (her owners are wealthy surburbanites who deal with her energy by putting her in day camp and doing lots of private training sessions with her to keep her busy).
Can't speak to breeders or rescues though. I don't know of Mollie is typical of the breed because she's the only one I've dealt with, but she is a great dog.
I knew a cute one who lived with some neighbors on their farm—they were a retired couple and took him on several long leash walks every day, and I assume he had some freedom around the place. He was protective of his owners' personal space but happy to meet a new person once given the OK. I didn't know him well and he died recently at age six (details unknown) but based on my first impressions I would certainly consider the breed!
My ears hear a symphony of two mules, trains, and rain. The best is always yet to come, that's what they explained to me. —Bob Dylan
I meet a person with a pair of them on my walks. They look like miniature Airedales. The two I see are friendly but uninterested in other dogs - they mind their own business. That can definitely be a plus.
I realize that I'm generalizing here, but as is often the case when I generalize, I don't care. ~ Dave Barry