We have had several bitches spayed at "3 months after the first season" in the past, no litters. Fay (setter) was spayed at 4years due to a pyo, she'd had one litter & was done at about 5 or 6 weeks after a season. Jas was done last year at age 8, one litter. Missy at 3, no litters, my sons boxer at age 5 or 6 (allegedly), ex puppy farm bitch so many litters. Fay & Zena(the boxer) are incontinent. My son thinks it may be because of having litters, I wonder if its because of the litters + not being spayed in between seasons? Just wondering. Anyway its not a big problem with Propalin or similar.