DId you know? - Metabolites in horse urine may include pigments that look orange or red when exposed to cold temperatures and seen on a white background. This may easily be mistaken for blood in the urine. If the horse is looking and acting normal, it most likely is normal. If there is straining to urinate, colic, depression, or other abnormal signs, further examination may be warranted.
So be attentive and observant, but no need panic over this common winter time phenomenon.