I would not have chosen to do back to back heats, but that was the requirement of the re-breed option. I have been told by experienced breeder mentors, my reg vet and the repo specialist that did the surgical AI, that it is fine. Actually the repo vet said it is easier on the bitch to do back to back as her body is "prepared" to be pregnant, than it is to wait a year or more in between. Believe me, I did have my reservations. That's why I asked all the questions before preceeding with the re-breed.