To move your cows, sheep, and goat very easily while they are outside, stand behind them, with the camera behind you. Press A when it says "Push." Push forward with the left analog stick, and steer with the right analog stick.

Also, if you are trying to get the animal to the water tub to wash it, and they are on the opposite side of the field, go to the button on the barn and "Call all animals outside." The animals positions will be reset, and they will be closer to the water tub.