Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this concern for Jackson. As long as he's not squinting nor keeping his eyes closed (which denotes pain and a vet visit sooner rather than later is recommended), then he may respond to over the counter medication such as ones which are listed below.
It's possible that he has just irritated his eyes in some way or perhaps allergies are causing them to be red but if he's scratched or injured his cornea (which is why he might be squinting), then I wouldn't wait to have him seen.
I'd recommend treating him 3-4 times a day.
The Systane products listed below can be used in dogs, but the ones with vasoconstrictors, such as naphazoline should be avoided. These products are labeled as "taking the red out" or for "red eye".
Tears Naturale Nighttime
Systane Ultra lubricant sterile eye drops
Advanced Eye Relief Nighttime
Akwa Tears ointment
Applying a warm compress to the eyes for 5-10 minutes 2-3 times a day may be beneficial as well.
If the eyes don't appear to be improving after 2-3 days and/or they're worse, then a vet visit may be prudent. I hope this helps. Deb