My dog intermittently gets similar eye problems. The vet showed us how to check his eye by pulling slightly on the surrounding skin to expose the pinkish skin against the eye. Normally, this is should be a light peachy color but if there is an infection it is a darker pink color. We have been given antibiotic ointment which helped clear it up but on other occassions it has gone away naturally.

To me, playing it by ear and just checking to inside eye skin color to see if that improves seems like an appropriate action. If this is the first time your dog has had this type of problem, it's still probably a good idea to check with the vet such that you can get similar guidelines for when there's valid cause for concern vs. a time to just wait it out.
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I'd still go see the vet, even though what you're doing seems to be improving it. The vet can tell you why it happened, as long as you go while it's still going on. Don't wait until it clears up if you want to know how to prevent it from happening again!
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Most likely an eye infection. My dachshund had the same thing. You can get some gel to put in the affected eye a few times a day and it'll go away in a week or less. Don't wait, as most infections won't clear up on their own - they can get worse.

The general rule for people and dogs is that any colored eye gunk or mucus may indicate infection. Clearer is better.
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