Overboard
Karens just love to go over the top in their actions, often due to the “principle” or the point they are trying to make. They see no problem with intimidating or humiliating an employee in order to make this point, so the snarling dog in the meme seems pretty spot on to me.
The praying mantis currently playing the role of the innocent employee trying to do its job looks terrified at the large animal snarling at it. Servers and sales assistants everywhere gird their loins as Karens approach because they know that they’re about to get yelled at for the most insignificant things.