Negative Space: dogs

…if you’re doing an experiment, you should report everything that you think might make it invalid—not only what you think is right about it: other causes that could possibly explain your results; and things you thought of that you’ve eliminated by some other experiment, and how they worked—to make sure the other fellow can tell they have been eliminated. — Richard Feynman (Surely You’re Joking, Mr. Feynman!^•)