Anesthetic losses are a part of operating unfortunately - however to lose two on the same day, with the same reaction would concern me. greatly.
The foaming almost makes me thing of some sort of aspiration reaction (as we obviously cannot put ET tubes into our little ratties) and the red was perhaps lung surfactant?
Jeez....
I cannot even imagine.
I agree with Jo that if these rats were not siblings that the anesthetic protocol for rodents NEEDS to be further investigated.
As frightening as that is, and i dont mean to sound insensititve by this, it will not stop me from doing elective and even moreso necessary surgeries on my little guys - mind you i am often right there beside them, as i work at the clinics i take them to, however I will discuss anesthetic protocols more closely with the Dr's before any of my kids go under again...