If they can't afford the surgery they can check this out it's a revolving line of credit for animal or human emergiencies (there are lots of vets that accept it and also a lot of animal hospitals). For a procedure of over $300 you get a pretty long deferral with no interest. Under that amount you get a very low interest with small monthly payments. Someone recommended it to me and I love it. I have used it in the past.
http://www.carecredit.com/faqs.html
Good luck with everything. Sending prayers and hugs your way.