I have never had entire female dogs due to not wanting to put up with seasons.
After when I took Pretty when she was hugely pregnant, had the pups, she was later due for desexing but her season kicked in a few days before.
All 3 were scheduled in the 2 week window between chemo and radiation. Only Jodi and Jessie got done together. (I told FIL he only had Jess as his dog if I controlled her uterus.)
Gakk. Once was enough. The 3 canine uteruses as well as mine have all been dealt with, lol.
Now I KNOW why I never wanted entire females instead of just thinking I didn't.