[Chihuahuas] Spaying small dogs and brain damage from anesthesia

[Nancy Lucky]

Okay everyone I feel so stupid but I have never ever heard of small dogs 
getting brain damage from having anesthesia or that you should not spay a dog 
under 6 lbs. I  have heard that if you don't  spay them they can get uterine 
cancer and infections and all kinds of problems. I have had both my chi's 
spayed and neutered and it was all great. But now I have Maggie who I will have 
to decide on. So where do I find the facts on the brain damage information and 
the pros and cons.I have trusted and loved my Vet for the last 30 years but 
maybe I am blindsided.
Confused and worried chi mommy - Nancy