Steps：

1. Spawn a horse
2. Use sugar, wheat, apple, golden carrot, golden apple, enchanted golden apple or hay bale to feed the horse.
3. Keep clicking the right button of the mouse with the food.

Phenomenon:

After feeding it a few times, the sound effect and the animation don't work, but the food keeps consuming. You may see the video first.

Expected Results:

Plan A: After the tameless horse's temper value is full OR the tamed horse's health is full, player can't feed it any more. 

Plan B: Horse can be fed infinitely, but with animation and sound effect. (Not Suggested)

Donkey, mule and so on are the same.