A yellow card--that's funny! Like in soccer.

Before Ingrid decided basically the hell with it, that she was gonna declare global thermonuclear war if anybody tried to touch her at the vet's, and scorched earth or whatever would result & she didn't care, she'd actually bitten all the way through one of my fingers (right through the nail) one time because she was so upset. And the vet's assistant put on the kind of gloves you may be talking about: these big, thick leather jobs like riveters' gloves that go all the way up past the elbows.

Nobody enjoyed all that drama. Least of all Ingrid.

So now we just gas her before an exam. It's so much easier!