Banning Ruby, because clearly, moaner Lisa is a heart surgeon, and heart surgeons don't remove hearts - they make them better again. Butchers on the other hand - especially butchers posing as surgeons - and especially, especially identity-borrowers posing as butchers posing as heart surgeons... well, they probably wouldn't remove hearts, but they might not have the same expertise as a surgeon, so the result might be a little... different.
By-the-way, Oreo looks like a vet, so if your cat needs an op, Oreo might be able to do it online for cheap. Vets are heart surgeons and dentists for a variety of animals, all rolled into one.