(one's) claws are showing
One has become particularly aggressive, confrontational, or spiteful. I think you need to calm down, Janet—your claws are showing. A few people's claws were showing, so I thought it was high time we got out of that party.
one's claws are showing
one is acting catty; one is saying spiteful and cruel things. Gloria: Did you see what she was wearing? I wouldn't be caught dead in it! Sally: Gloria, my dear, your claws are showing.