Looks good to me.
So...
Skeletal Heavy Warhorse
Large Undead
Hit Dice: 4d12 (26 hp)
Initiative: +6
Speed: 50 ft. (10 squares)
Armor Class: 13 (–1 size, +2 Dex, +2 natural), touch 11, flat-footed 11
Base Attack/Grapple: +2/+10
Attack: Hoof +5 melee (1d6+4)
Full Attack: 2 hooves +5 melee (1d6+4) and bite +0 melee (1d4+2)
Space/Reach: 10 ft./5 ft.
Special Attacks: -
Special Qualities: Damage reduction 60 ft., damage reduction 5/magic and silver, immunity to cold, unnatural aura
Saves: Fort +1, Ref +3, Will +4
Abilities: Str 18, Dex 15, Con -, Int -, Wis 10, Cha 1
Skills: -
Feats: Improved Initiative (B)
Challenge Rating: 2
Treasure: None
Alignment: Always neutral
Unnatural Aura (Su): Animals, whether wild or domesticated, can sense the unnatural presence of a headless horseman's mount at a distance of 30 feet. They do not willingly approach nearer than that and panic if forced to do so; they remain panicked as long as they are within that range.