Best practice

Horses are herd animals and should not be housed alone. 
They do best when there is at least one other horse with them.
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Needs intervention

If it is not practical to have a companion horse, goats or cows can also be suitable companions.

Humans are not sufficient companions

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Immediate jeopardy

Intact stallions should not be housed with mares.  Stallions as young as one year can successfully breed.  Stallions should be castrated or housed separately with other males.