Black Beauty

Black Beauty (aka Buddy II) is the child of Slow Horse and Sir Buddy. He wears a set of iron horse armor.

Challenge Advancement Arc
Dan needed to complete the challenge 'Two by Two' which requires breeding every animal, so he goes to the horse stables to breed Sir Buddy and Slow Horse. He realizes that he needs to breed them with golden carrots, so goes to get some after realizing Sir Buddy was jumping on the haybales. After he came back, Sir Buddy managed to climb onto the roof of the Stables, presumably because he didn't want the burden of having a child. After standing in the sand, clearly flabbergasted as to how he got up there, he clambered onto the roof and breeds them giving birth to Black Beauty, who had the fur colour of Sir Buddy.

After he stole the skeleton horses, he saw that Black Beauty was all grown up. He tames him and although he had some trouble with him, he manages to tame him and puts a saddle and iron horse armour on him.

Death Arc
Dan never really interacted with Black Beauty ever again, even forgetting who he was, calling him the 'spawn of Sir Buddy.'