Dog cock is better, on large dogs it's big sized, it has "the knot" and OMG, that penis cums a lot. Aesthetically looks me really sexy. I must admit horse cock makes me feel weak and I don't know why, maybe cause of its cock-head and smooth shaft. It seems a giant human cock which makes I see horses as the masculinity at his best, but in terms of perfection I still think dog cock looks designed to be fucked and sucked for any female. Perfect size, perfect shape, perfect smell and taste and, for sure, most functional dynamic, skilled and beautiful dick in the world