Join Date: Aug 2006
Location: San Francisco Bay Area
Submit Photo: 5
Photo Submissions 19 Times in 13 Posts
I am certainly no expert in this area and am very fortunate to have never experienced Pyo, but my understanding is that any unbred cycle of an unspayed female brings potential risk of Pyo. That is why it is so important to spay them if they are not going to be bred. That is also one small reason why some repro vets will push for more back-to-back breedings. "A pregnant uterus is a healthy uterus" is the quote I've heard used.