Here is a site I found a few years ago - I wish I could help more but they do help in Emergency cases -
http://www.imom.org I had emailed them for my sons sick weiner dog and they responded to me within days -
I'm so sorry about your baby - I hope you can have the surgery and that it's sucessful - That's really sad news but the good thing is they can treat him. GOOD luck and keep us posted.
IMOM's MISSION STATEMENT:
Our Goals To see a day when we never have to tell a financial aid applicant "we're sorry, but we have no funds available to help your pet". No animal should ever have to be euthanized because their person simply does not have the money to get necessary veterinary care to save its’ life.