My puppy has conjunctivitis. What OTC remedies can I use at home?

Poor Carly! Conjunctivitis can be uncomfortable, so I'm sorry to hear she is having issues with her eyes! Unfortunately there isn't much over the counter you can use. You can safely use eye saline (contact lens saline) to gently flush out her eye in case there is any microscopic debris causing the inflammation. It is possible that Carly has a scratch on her cornea as well, which can be mistaken for conjunctivitis. I would be concerned about a scratched cornea if her eye is quite red and if she is squinting. Most cases of conjunctivitis require a prescription antibiotic ointment or solution that is applied topically in the eye. I also like elizabethan collars on dogs with eye issues, as they often will paw at their eyes and make any eye issue worse. If it doesn't improve with a little saline flushing, I would recommend you take Carly in to see your vet to make sure it isn't a scratch and get some topical medication. Best of luck to you and Carly!