Ohh, man, what a sad thread!
First of all - spaying does not affect a dog's working ability. My spayed females have worked sheep successfully and well. They also guard well - I have four spayed bitches and not only are none of them fat and lazy, they are quite alert and active and they keep their minds on their jobs instead of having those minds swayed by hormonal changes. Spaying your dog would make her BETTER because there wouldn't be times that she has to be locked away.
Second - I don't think you can even call your dog a "working dog" - she's simply a dog that hangs out with the two sheep .. *L* .. so your excuse is moot.
Third - if you're collecting money for puppies, then you're selling them. It would be different if you had said "I'm asking $50 per puppy as a refundable deposit once proof of spay/neuter has been done" .. but that's not what you said. You're asking money and you'll pocket that money and it won't change a thing as far as getting "responsible" people to take the pups.
I've seen people pay thousands for a horse and then let it starve to death. It's a misconception that asking money will only bring out responsible people. As someone trying to find homes for these pups, you should have an extensive application process. You should ask about vet references, fenced yards, training methods, etc. But I'm guessing that you're just asking for the money (yes, I could be wrong, but surely you'd have mentioned these other things by now).
Fourth - dogs do not come into heat by YOUR calendar, as is obvious by your continued statement that your dog came into heat two months before you expected. This could happen again, of course! Just like humans, some dogs have a regular cycle and some don't. It's easy to excuse it by calling it a silent heat, but the fact of the matter is that you don't even know because your "working dog" was off with someone else for at least a month.
It's your responsibility to make sure this doesn't happen again, and that those pups that you have now produced don't go on to breed too. There's just no comparison between you and a responsible breeder, so trying to shift blame to them is ridiculous. A responsible breeder not only keeps their dogs from having accidental pregnancies, but they have dogs that are health tested and temperament tested, dogs that are proven according to the breed standard and have shown that they have something to offer to the breed. To say you know more than the rest of us about breeding only shows your ignorance.
I've lived with intact females for seven years and have never had an accidental pregnancy.
I do hope you find good homes for those pups, because they deserve good homes. And I know you feel people are harshing on you here - and yes, they are - but they're doing it because they don't want to see more unneeded mixed breed pups produced when hundreds or thousands are destroyed every week due to a lack of homes.
Melanie and the gang in Alaska