Can female dogs be born without a utureus and ovaries?

It is possible, but mutation like that wouldn't explain the scar tissue.

If she was born deformed, there would just be normal flesh were the organs should be, not scars. Scars form when somethign is removed. Most likely, the breeder has done something and doesn't want to admit it. It's possible it was an honest mix-up and he doesn't know of anythign himself.

The Vet would know if the dog had been operated on.

It is possible to be born without certain organs, obviously some more life threatening than others. If the vet the opened up the dog never mentioned any previous operation then it's likely the Breeder is telling the truth

Almost certainly. Humans can have a condition called Turner's Syndrome when they only have a single X chromosome and no other sex chromosome at all and when this happens, they appear to be female but have no uterus or ovaries. When this happens in humans, there is what looks like scar tissue where the ovaries would be. Since the basic form of the body, and this would include dogs as well, is female and the male body develops from a female form in the womb, a "sexless" animal will usually seem to be female. I am almost sure this is what's happened, but i couldn't swear to it because i am a herbalist for humans and not a vet, so i have a doctor's education and don't know as much about the health or bodies of dogs. But i would be prepared to bet that this is what's happened.

I agree with the others, being born without her reproductive organs wouldn't explain the scar tissue. Seems like she's been operated on before.

i agree. i think something was done to the pup. there should be no scar tissue if it were just a birth defect. scar tissue is caused from haveing surgery. sounds awfully strange about that breeder. if she had been fixed that was very young to have had it done.