Heel!

https://commons.wikimedia.org/wiki/File:C._Darwin,_On_the_Expression_of_Emotions_in_Wellcome_L0031425.jpg

In walking through a park and observing the signs, ‘All dogs found on these grounds without their owners, will be shot,’ a friend of mine exclaimed, ‘That’s a hard case for dogs that can’t read.’

— Irving Browne, Humorous Phases of the Law, 1876