Animals were a big part of life in medieval times from pulling carts, plows, and doing caravans. I think if this is not added, it would be a waste and make the game feel less real. How do you think people cleared land to farm and take trade items to markets far away.... with animals and they need to have their due in this game as well. This would be great for the game especially if they ended up putting breeding into the game say for stronger animals or faster ones. Strong ones could pull more weight and faster ones could get people to places faster than regular ones. This may add to much complexity to the game, but it would be a neat concept and it would end up helping the game economy and ascetics by making it feel more real.