Our vet does not PTS a healthy cat unless they have to, like they have tried very very hard to persuade the owner to sign the cat over to them but the owner insists, our vet knows we would never refuse such a cat no matter how full we were although the very may have to keep the cat a few days which the don't mind. (what a shame it would be if the owner left a cat at vet vets and did not wish to see the terrible deed and thought the vet had but they didn't, surely that would not happen at any vets, would it?) You may say they can refuse, however very close is another vet who would without a moments hesitation.