You are now able to protect non-lethal mobs from taking damage inside your world guard zones. However, the damage will only be blocked for people who are not added to your zone. You are able to protect any non-lethal mob that you choose. This can include horse, pig, sheep, villager, and all other non-lethal mobs that you can think of. You cannot just request all damage be blocked and you actually need to list out each animal that you want to protect individually.
More information can be found on the Wiki.