Maggie (yellow dog):
We had just gotten married, moved to a trailer in the middle of nowhere, and for the first time in my life I was spending copious amounts of time totally alone in a house (I grew up in a six-kid family, the oldest), because Patrick was working three jobs. I was starting to think in terms of sheep already (it's been a lifelong dream to have sheep), and when we passed the box of little fuzzy puppies at the flea market, the person said there was some "shepherd" in there, maybe. I was kind of dog-dumb and didn't realize "shepherd" didn't mean Aussie.
So Maggie came home and changed my life. Shepherd mix my Aunt Matilda - she was the Border Collie everyone warns you about, except she isn't all Border Collie - terrier and spitz in there, probably. She led me into obedience, disc dog, agility, flyball, and then other dogs that could do the same.
Lu (Maremma/Pyrenees mix):
When I first started in sheep, we lost our little starter flock of Dorper ewe lambs to a pack of neighborhood dogs. Halloween night we woke up to a gunshot and our neighbor yelling. We went out to a sight I will NEVER see again, I hope, no matter how much it costs to keep a good livestock guardian around. All our lovely little pedigreed lambs were lying around in pools of blood.
Please note, a domestic dog typically doesn't chase and kill - they tear out chunks of the animal while "playing" - bits of shoulder, rear end, flanks, pieces of face - about a third of my flock lived a few more days after the attack, though in the future I'd put such animals down. The dogs were caught and IDed and the owners denied any responsibility.
So I called the breeder of the sheep to get a market value on the lambs to give to the dogs' owners . She said a friend of hers had bought an LGD pup but he didn't like it - she was too friendly towards people (!) and he disliked the extra step of having to catch her when he wanted to work Border Collies. Of course, since they were beating her off them every time she came for snuggles, it made her a little hard to catch. (!!)
So that was Lu. Lu's littermate Rose was a star on NPR's All Things Considered for a time so Lu has celebrity blood. LOL.
Fast forward a few years, because around this time is where Ben (working BC and heart dog) and several other Border Collies go, who are no longer with us. :(
Tully (Maremma) was the next one to arrive of the dogs that are currently here.
I had a male that I had bought as a pup when Lu was about three or four, I guess, when drought brought intense coyote pressure on our farm. He grew into a terrific dog, and was registered, so when someone approached me about bringing a female she had to him, I agreed to breed my first and only litter! Tully was my stud pup. I wanted a female but there were only two and we'd agreed to have the breeder keep one, and the other died.
I'm glad now I ended up with a male - girl Maremmas are a little more standoffish - the males are big Teddy bears. I sold his sire to a guy who desperately needed a dog and I didn't need three dogs anymore and liked Tully better - Tully's sire was a much grander sort of dog but a bit more people-aggressive which was less of a problem for the guy who bought him.
Zhi came next.
I had just lost a good human friend and mentor in things sheepie and doggy. I was feeling very vulnerable, I guess, because when I volunteered to transport/foster a Chinese crested puppy for a couple of days, I took one look at her scruffy, unhappy self and for the first time ever, failed Foster 101. She was a "rescue" for about two hours - most of that time spent on the road coming to me.
Zhi is my personal therapy dog. Grooming her is therapy for me and a nice change from my wash and wear crew.
The next working dogs came when Ben started slowing down, and I had just decided that the two pups I'd raised to work the farm, had no business on a farm. One didn't like to work, and the other was a downright sheep killer. Unfortunately, it took her actually killing a sheep for me to admit it. Please note above how a domestic dog kills a sheep. Imagine that being done right in front of your eyes. But I did have a friend who trained dogs to work on airports, clearing large flocks of migratory waterfowl off the runway, and she had been after me for some time to have these two and a littermate I was keeping and training. The sale of these dogs went towards Cord, Gus, and a puppy.
Cord (working BC) came as a result of a conversation I had at a trial. Poor Cord - then as now, there just didn't seem to be a good place for him in life. What Cord wants most is just to be someone's buddy. But his pedigree kept getting in the way. None of us could be convinced that a dog bred like him simply didn't want to work.
So I took him to try on the farm. He worked fine for a while but this year he finally quit completely. But, I'm grateful that he held out long enough to fill the gap between Ben and Ted. He also showed me what kind of pup I'm looking for next, ie, the style of working that goes best with Ted's style.
Gus (working BC) came from a good friend who had just discovered that Gus was going deaf, a problem that's been discovered in some good lines of Border Collies. The amount of hearing he has, doesn't preclude his working on a small farm or even doing novice trials, so he placed him with us for a pittance.
Gus is a terrific dog and I weep bitter tears because most of the great parts about him are from the now extinct line. They are working on a DNA test so that perhaps the line can be revived in the future, if the test doesn't come too late. I got Gus because I was looking for a dog to help Patrick with chores, since his previous dog had been retired to a place where he could do much lighter work.
I purchased Ted (working BC) as a pup, when I realized that Cord wasn't going to make it for the long haul, and honestly I wanted a dog I could start from scratch with after making a career of other people's leftovers. I will forever bless the day that Ted's breeder mistakenly posted the breeding announcement on the BC Board, which is a no-no, and I saw it before it got taken down. He's on the up-and-up - heck, he's an ABCA board member - he just honestly didn't know you couldn't announce a litter if the pups weren't all spoken for already. There had been a bunch of such announcements at the same time and he just wanted to share his excitement, too.
Anyway, Ted's breeding went back to the same combinations that made Ben the dog I loved. And indeed it's happened that Ted is like Ben, on expresso, plus with moves on the sheep that make top trainers and handlers go "Oooh." 
Lynn (mix):
I've told Lynn's story zillions of times. She was a rescue from a shelter down east, and a friend of mine out west spotted her on Petfinder. She was listed as a Belgian shepherd and indeed she sort of looked like a Terv puppy (in the pictures), and so they pulled her and I offered to be a waystation foster to get her vetted and ready for the trip to Texas.
A couple days after she arrived here, she came down with parvo. $1000 later, my friend was not so much interested in Lynn, although bless her heart she would have anted up if I'd insisted. Plus Lynn totally didn't need to travel across country while still recovering from parvo as she was still rather piddly at the time.
Finally, PJ suddenly announced that Lynn was HIS puppy. She had taken to sleeping on his bed and I told him it was because she was a mini-Leonberger, which are bred to guard children - mini-cheese burgers are his favorite food. PJ loves the idea that "his" dog protects him - he's a child with a lot of insecurities so Lynn's been really good for him.
Min (Maremma):
I got a call from someone who was frantic to find a home for two Maremmas that had been abandoned, a couple counties over - the whole farm had packed up and left and they were left behind because no one could catch them. Now animal control, after some half-hearted attempts to live trap them, were getting ready to go shoot them.
So we went and after a really interesting adventure that lasted about three hours, got them in crates in my truck. I still think Providence was at work there, because I can't imagine catching Min today the way we did that night.
Min's sister was actually pretty people friendly once you got her away from her sister. And, she was older and more confident in her working style. Min was a little uneven though I cuold tell she'd end up being the better dog once she got some maturity and experience.
So I kept Min and her sister went to a friend who desperately needed a "Plug-n-Play" LGD. Min did indeed settle down with a lambing and a feeding season under her belt.
I'm getting ready to loan her to a friend until we get the sheep in more pasture, and she'll learn more up there (she'll also have some sheep from here, with her, so she won't feel like she's had her "babies" taken away yet again).