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Hi this is Dr. Evans, are you available now?
Hi there, tell me, do you have a picture of what youre describing? There are several things that can present like this.
Also when did this first happen?
Those are signs of discomfort. Your dog could have a scratch on the eye, conjunctivitis, uveitis, or glaucoma. Has this ever happened before?
Do you happen to have any antibiotic eye ointment in the house?
Yes, these problems don't make them act differently, just very uncomfortable.. It's similar to having sand in your eyes you cant get out. I'd call your veterinarian in the morning, they can prescribe eye drops that will make the eye open wide (and comfortable) almost immediately.
No, heartworms only effect the heart.
one more thing
If you can't get into your vet tomorrow, grab some human artificial tears from the pharmacy and administer a couple drops 3 times daily.
Have a good night!