Hi Mike, If the discharge is yellow then puppy has an infection and should be treated with a topical eye ointment. Your vet can check the corneal surface for abrasion and if clear give you a corticosteroid type ointment that will alleviate the discomfort while helping with the infection. If puppy has loose fitting eyelids check that they are not rolling inwards and irritating the eyeball itself. Seasonal allergies especially high pollen times or pollution can cause eye soreness, if you are in the country with harvesting going on or lots of trees around then it may be pollen. Check the products you use in the home and garden and limit those with added perfumes. These chemically enhanced plug in air freshners or aerosol sprays are not good for sensitive tissue like the inside of the eyelids or lungs etc. Does anyone smoke in the house? Review your environment, have carpets been cleaned lately, local yards sprayed for weeds, new perfumes etc.
If your dog's eyes are not improving then it is essential to consult with an opthamologist to determine if there is a physical reason. Any problems with itchy skin, yeasty ears, chewing feet? Review your dog's diet if the opthamologist cannot identify a specific eye condition. All the best and let us know what progresses. Conjunctivitis must be treated. Rose T.