Well, to be fair, I haven't a lot of horse poop around for a real comparison as to which one he would choose. But while I had a husky who would eat all the horse poop she could find on trails when I would take her out running, the breed I have now do not seem quite as interested in eating or rolling in it when they are out on the sheep farm which also has some horses. The great thing about the husky was she cleaned herself up like a cat. The bad thing about the husky was the extremely high prey drive, and while she was fine with the cats she had been raised with, I never would have trusted her with any other cats. All outside wildlife was fair game to her.
But they do like the litter box when they can get to it.

How is new pup working out for you?