Will a dog eye infection eventually resolve on its own?

The answer's typically going to be no. The word infection might be a bit tricky because we're not necessarily seeing a lot of infections. It may just be an inflammation situation or maybe a certain disease. But often when eye things come up, unless it was something in the eye and they were tearing a little bit and 10 minutes later it was fine, treatment of some form is needed to fix it. If you don't address it, more chronic things start to happen. I would stay on the side of caution and not assume it's not going to go away on its own.

95% of the time, no. Eye infections typically need treatment, even if they're viral. This could include drops to help keep the eye moist or antibiotic drops if it's become a bacterial issue.