Horses can be bit by snakes, and the nose is a prime target. Look for paired punctures from fangs and watch for swelling that can make this and emergency.
Horses do sunburn on pink skin areas in summer and winter. Long fly/sunscreen masks help prevent face burns; various sunscreen agents also work if applied regularly.
When tears run down the face from the front corner of the eye, the duct that normally takes them into the nose may be blocked. The vet can unblock this duct with little trouble at his or her next routine visit.
Muscle damage associated with tying up can cause dark brown urine. Note that urine in snow has a surprisingly dark orange color-and that is normal.
Abdominal pain, founder, and shock may cause sweating which is inconsistent with the air temperature. Call your vet. Heavier pressure from the saddle will compromise normal skin function and result in a dry patch.
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