Huxley & the horse

If you substitute a horse for the cow in the above cartoon, you have a regular encounter on one of our (doggy) walk routes. There's a horse in one of the "yards" along the way, and Huxley, is just fascinated by him. . As in the comic, he's more curious about, than scared of, the horse. In fact, he enjoys walking right up to the fence and sniffing him. But he can't figure out why the "giant dog" won't bark back at him.