After completing his training, Hans received a lump of gold as a reward, which he took out into the world. As the lump of gold soon became too heavy for him on his journey, he exchanged the gold for a horse, which he rode on. But it wasn't long before the horse threw him off. So he swapped it for a leisurely cow. What will Hans have left after all his bartering?

Hints:
No known age or size restrictions