Pure Only Breeds

As requested, this is a list of all the breeds in the game that cannot be cross-bred.

Normal Breeds
A Centaur
Abeyan Arabian - At one point this breed did not have to be pure, so there are some cross-bred ones around
Arabian
Awesome Equinerd
Boulonnais
Butterfly Horse
Canadian Warmblood
Colonial Spanish Horse
Cow
Delightful Friesian
Dread Horse
Flaming Aethiops
German Warmblood
Gypsy Drum
Horse of Hades
Horse of the Future
Hungarian Warmblood - At one point this breed did not have to be pure, so there are some cross-bred ones around
Immortal Balius
Kathiawari
Kerry Bog Pony
Medieval Warhorse
Meras
New Forest Pony
Odins Ice Steed
Pegasus of Athena
Quarter Pony
Salerno
Steed of Zeus
Swamp Moose
Trojan Horse
Unicorn of Huang Di
Zebra

Halloween Breeds
Creepy Cream Draft
Devils Steed
Ghoulish Griffon
Gotland Ghost
Halloween Hanoverian
Headless Horse
Hell Horse
Lifeless Lustiano
Mummified Morgan
Phooka
Pumkin Pony
Skeletal Sport Horse
Spooky Shetland
Thestral
Trick or Treat Thoroughbred
Witchabian
Witchy Warmblood
Zombie Zebra

Veteran Breeds
Alicorn
Ethereal Horse
Night Horse
Sea Horse
War Horse

All Private/Player Made Breeds
None of the player made or Op made breeds are crossbreedable.