It is called anisocoria, or uneven pupils. It can be caused by various things and may be neurologic, genetic, viral, etc.
-neurologic problems such as inflammatory processes, trauma(hitting the head hard on something), viral infections and tumors of the brain or nerves associated with the eyes and other causes.
-pressure problems within the eye due to a developmental anomaly, permanent injury or others
-genetic issue
All in all....1) don't breed it in the event this is a genetic issue and 2)take them to the vet
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