An "equilibrium issue" is neurological. There are a couple areas in the brain responsible for balance, and the brain and spinal cord work together for maintaining posture and righting reflexes. "Wobblers" have been known in other species for a long time, and in some cases it is due to cerebellar hypoplasia -- underdevelopment of the cerebellum, which is part of the brain. To my knowledge, no one has examined wobbler BPs to determine the exact mechanism, but it's definitely a neurological defect.
It is my firm belief that we should breed for health over beauty or else we will end up with genetic disasters like has happened in dog & cat breeding.
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