I talked to the Repro doctor yesterday in person visit, to go over all my options and concerns.He said he COULD remove the uterus but since she had pyo already it is a lot harder to not leave any tissue in there but he thought he could do it. (I go to a Repro hospital and pay more for their experience!) if I wanted an OSS. He said no benefit to leaving one ovary in. He also mentioned false pregnancy as another matter if she kept her hormones. He said to leave both ovaries in if I wanted the OSS. He also did say that he would leave the uterus in if I decided on the ovary removal because he said the uterus is progesterone sensitive and it would not be an issue without the ovaries. He said that Blossom got pyo because she is probably hormonally sensitive to the progesterone. He said pyo is first a hormonal disease. So the conditions were ripe for her infection and said she would probably get it again. if she remained intact. I would like her to keep her hormones but don't want problems hormonally yet to be manifested. I do not mind the heats etc.... but don't want any other health problems. I believe she may be 4 or even 5 years old. I hope there would not be too many changes in her personality. I told the doctor I liked her nesting and mothering tendencies. He said if she does it when she is not in heat then the spay would not affect that. I am concerned about her becoming more fearful or aggressive with a full spay like I saw with another dog I know. I like her personality now. The doctor said that with ovaries only left they can get ovarian cysts. So how common are those? Also what role would progesterone sensitivity play in any future problems either generally medically or with her ovaries? I really do want her to keep her hormones. Has anyone ever done an OSS after a pyo and had a dog who lived with few problems related to hormones since pyo is a hormonal problem. Like the doctor told me: once you take it out you can't put it back in.