Aw man. Zoey has become one of my board favorites. I am so sad to see that she is hurting. That it is just a sprain or something minor. I would be willing to chip in to help pay for vet bills if you need. Hugs to you as well, you have had way to much to deal with lately.
Is the cost of the surgery the reason for euthanasia? Is it because you feel she'll be unadoptable? Are there no resources to help with the cost? Doesn't PBRC have a fund? What if you requested the money, and then we requested for you also? I think if a blind great Dane and her great Dane seeing eye dog can be adopted-together- Zoey has a good chance. Is she not a good fit for your home?