Oh I am so very sorry about your situation

(( What a horrible dilemma to be stuck in. Here's a suggestion but don't feel bad if you don't try for this, ($4,000 is mindboggling) but could the clinic set up some kind of payment plan? Here's a link that might also help--
http://www.aspca.org/about-us/faq/fi...vet-bills.aspx
My thoughts are with you

Terry