This is why epiphora, or watery eyes with excessive tearing, resulting from a blocked nasolacrimal duct shows milky secretions from and around the eye. Matted damp fur surrounding the eye and on ...

Blocked tear ducts—also called nasolacrimal duct obstruction ... It can cause crusty strings of mucus in or around the eyes. You may also feel burning or stinging, and vision can become blurry.