Undead animals

 are animal variants found in the Undead Nightmare DLC Pack for ''Red Dead Redemption. ''

Characteristics
These are animals Infected with the undead plague. They are different than their living counterparts, sporting blood red eyes as well as open wounds covering their decaying bodies. They are unleashed into the world after purchasing the Undead Nightmare Pack, and are generally found in the same areas you would find the living version of the same animal.

Undead Horse
The zombie horse will appear when you whistle for a horse too soon after your most recent horse has died. They have unlimited stamina and average speed. The downside of the zombie horse is that they automatically move slightly to the left or right even when not steering. They are not hostile, unlike the other zombified animals. Undead horses can also be found roaming throughout the world and can be lassoed and broken. If killed, looting carries horse eyes and horse hearts. Every now and then when you loose a steed, your whistle will attract an undead horse, intending it was your previous horse that became undead.

Undead Bear
In spite of having a frightful appearance, these bears are actually much easier to kill than in the standard RDR game, often requiring only a single headshot from a repeater. When killing the undead bear with a torch for the Undead Hunter challenge, using the torch from horse back, especially one of the Four Horses of the Apocalypse, makes this much easier.

Undead Cougar
They're basically the same but albeit more nasty

Undead Wolf
Travels in medium to large packs, similar to the standard RDR wolf. Undead wolves have black fur and are covered in wounds along their legs and chest (resulting in exposure of bones/spine as with other undead animals). by eric

Undead Boar
The undead boars can be found around MacFarlane's Ranch and Tall Trees. The zombie boar is covered in patches of exposed flesh. Looting carries tusks, eyes etc.

Undead Bull
The undead bulls are noted by their exposed spine and can be found mostly in Mexico and in Hennigan's Stead. Looting them yields horns. They are not hostile and will flee when approached, if provoked they will charge the player (Xbox 360 confirmed)

Undead Coyote
The Undead Coyote is recognized by their almost skeletal dog look. They can be found all over the map. They are also a lot more aggressive than their living counterparts.

Undead Dog
Found around cities. Found in large packs.

Undead Bat
Undead bats can be found all over the map at any time of the day. Occasionally a large group will disperse from the ground when you fire your gun or get too close to them. They are a huge (wingspan approximately six foot) black bat with features similar to a pallid bat. Looting yields Undead Bat wings.