When my Polli arrive off the hauler that had been detained an extra 5 hours making her journery 36 hours!!! , I was very concerned about just rushing her into having a spay. She was scheduled for a spay 3 days later but as luck would have it, I was able to bring her home and have MY vet do it (who does all the LI greyhounds) 10 days later. Even still, anethesia was rough for my Polli.
Surgery isn't the problem, it's anethesia, just like for humans.
I am so sorry to hear about Birdie.
Run Free Sweetie.