Legend, and reality appears to agree, says during the Great Depression, itinerant workers e.g. hoboes, would let each other know about the conditions of the road and towns that they passed through by using a language of signs. If there was a chance of work, dangerous dogs, vigilant police, that could all be read in a sign left by scratching a nail, rock on metal, etc.
One of those signs was the cat. This signified that a kind hearted woman lived at a home or farm. A hobo might hope to get at least bread and butter and perhaps a cup of milk. Being that I like cats quite a lot, it always appealed to me that a cat would signify someone who cared for others. The people wearing the pinky pussy hats at the very successful marches around the world also got me thinking about this.
I think this sign would make a good thing to let people know that kindness still exists, a kindness with claws behind it.
Here are some images I made up. Please use, but do not abuse, if you’d like. Larger/hi res/different format ones are available. Leave me a note in comments.