Zombies should go after horses if they are not near a player or a Villager.
There could even be a rare chance that the horse gets converted into a Zombie Horse, which will chomp down at the player. If the player tries to block off the horse with a two block wall, it will jump over it; sense the horse could jump that high in the first place. If the player tries to block it of with a 4-5 block wall (the sizes of most small trees), it will jump up. Why 3, 4, and 5 blocks? Well it's dead. It can't feel its feet sprain.
This suggestion was submitted by Wither_Men, and I hope this gets read, or even considered for the actual game.
[uhhhh i dont know how to actually end this so err]
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