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My name is***** and I am sorry to hear that your pup has a runny eye. There are several possible causes of this-
-blocked tear duct
-eyelash pointing inwards instead of outwards (dystechia)
-foreign material stuck under the eyelid
-early KCS (dry eye)
-tumor on the eyelid.
-ulcer on the cornea
-pain in the eye like from glaucoma or cataracts
I would recommend having your vet check your pup's eye for all of these conditions. They can then prescribe the treatments needed.
Does this help? What other questions do you have?