08-15-2013, 09:26 PM
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If it is really red, then it could be blood in her urine. A mare does not bleed while in heat, it is more a whitish discharge. The urine can get very dark at times depending on what is being fed, how much water she has drank etc. If it is blood , you need a Vet. Sometimes the socks will look very dark colored from urine and dirt stains.