Hey Amanda!
So we're a municipal shelter here in Texas. We have condos in our lobby we have dedicated to FIV or FeLV positive feline friends. We had a generous benefactor in our community who LOVES these types of cats after adopting two outdoor community cats, and both of them had each of these. They donated 5k and redid our condos, then the following year donated an additional 5k and we started a specific fund " The 5'o clock fund" in memory of our benefactor's cat. With this fund, we pay all adoption fees, provide them with a 30 day certificate to a specific vet where they can do a full blood work panel on us to have a baseline for their new friend and then we send them a $150-200 order from Chewy to their doorstep with specific items we think would help cats with these illnesses. Specific water bowls, beds, food, etc.
Half the people do not even do the free blood work provided to them.
If it's not, I would make it part of their adoption contract that the bills will only be covered at XYZ vet, any other vet will be at adopters own cost. Have them initial the line specifically and sign the bottom of the contract. They may get mad but it's right there. Maybe even HIGHLIGHT that line on the FeLV adoptions.
Good luck!
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Angellee Vincent
Volunteer & Events Coordinator
Grand Prairie Animal Services
Grand Prairie, TX
www.gptx.org/paws------------------------------