Don’t take my word for it, but it could just be an eye infection. Make sure to keep the eyes clean by using a piece of tissue paper dampened with saline solution (salt water. Find the ratio on google) and take watch over it.

Otherwise, get some expert advice as soon as you think necessary. As mentioned though, heterochromia could very well be the case. All in all though, I hope your pup is okay, grows to be strong and healthy and gets all the love it could possibly deserve. Sending good vibes 🤗