Join Date: Aug 2009
Location: Ontario, Canada
If it's a large amount of thick mucus I would think some kind of a Rhino virus (upper resp), and if it is accompanied by any coughing, listlesness or change in appetite I would call your vet.
If the discharge is very thin, white and ina trickle it sounds like allergy. 'Tis the season for allergies! If the horse shows no other symptoms I would tend not to be overly concerned about it. If there are other allergy synptoms there are management stepd you can take to help out your horse.
As always, if you are quite concerned, consult your vet.
~Lindsay~ Mom of 2, wife to the goldsmith, doula and childbirth educator in training, life-long horse dork