Anytime a cat stops eating for 48 hrs, it's time for a vet visit. If it was me, I would take them to a different vet than the one you called.
In the meantime, try offering some plain chicken baby food (Heinz is a good one) or a really stinky canned food like one of the fishy Fancy Feast flavours, or some Temptations treats, or whatever you can think of that might help jump-start Kooper's appetite. Some more tips here:
"To close your eyes will not ease another's pain." ~ Chinese Proverb
“We must not refuse to see with our eyes what they must endure with their bodies.” ~ Gretchen Wyler
Last edited by sugarcatmom; June 27th, 2013 at 10:17 PM.