Horses > Reproduction
The health risks to the stallion with a retained testicle are actually quite minimal. There is a slight increase in incidence of cancer in retained testicles in stallions, although this is not as great as in other species such as reported in dogs and in men. Some stallions with one retained testicle are reported to have excessive aggressive behavior compared to stallions with both testicles descended. The thought being the retained testicle causes irritation resulting in the aggressive behavior.
Blood at the top of a stallion’s sheath or on his penis could be the result of many things. To properly determine the cause I would recommend having the stallion examined by a veterinarian.
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