L.N.
Before my mother had gallbladder surgery she went on a diet of only rice and applesauce and it cleared up completely after less than a week. She said fried foods instantly aggravated the condition, but has not had any problem with her gall bladder since -- no surgery and this was over five years ago. Of course, your dog is not apt to want or need apple sauce but you might try chicken and rice.
We had an old dog (13 in people years) who, in his last three years, would seem near the end and then be revitalized with a diet of skinless chicken, which I would boil and chop and mix with rice (about 2/3 - 3/4 rice). He made a lot of come backs this way. We would also sometimes mix canned chicken dog food with cooked rice. He couldn't eat dry dog food at all his last couple years.
I'm sure the surgery is unbelievably expensive. If it's not urgent, you might try restricting your pet's diet and see if that helps.
I've also heard recently that pets can be treated successfully using essential oils -- there's a book about this that you can order at:
http://stores.lulu.com/store.php?fAcctID=1909571
I haven't ordered this book yet but am planning to as I have had very positive experiences recently for myself with essential oils and mixed some into some of my oils into olive oil and water which I rubbed on our dog and his skin looks much better (he gets something like ezcema).
Good Luck, and please let us know how this goes.
L. D., mom of three plus a dog