
I have experienced a bitch with split season successfully mating and carrying a litter.
She normally has quite long and heavy seasons, usually bleeding throughout the matings.
This particular time, her season seemed to be over in 2 weeks. No more blood or swelling, so I assumed that she had finished. One week later she started bleeding again, very heavy. One week later again (day 28 from the start) I took her to the vet, worried about a pyo. He looked up inside her, and told me that it was a perfectly normal season!
I got home, only for her to mate with one of my lads as soon as she had chance. Only the one mating, day 28. She had a litter 9 weeks later, no problems.