I dont know the size of the area you rehome to Sharon, but we have a policy where if they use our vet, it is included in the adoption fee, all they do is show their adoption paper to the vet, and it goes on our bill. When we get our invoices, the vet nurse kindly writes the name of the person next to the spay, so it is a lot easier to make sure it is done. Could something like that be implemented? I still ring people up, although dont do everyone at the moment (we are changing our system this year so I can)