It has been shown that humans are the most
asymmetric in their handedness - meaning we have
about 9 righties to 1 lefty. Dogs, cats, and
other animals are very symmetric, not showing a
preference for one side or another. From this
information, I would say that a dog preferring
to shake paws with it's left or right would have
no effect on the animal's physical or mental
behavior. That being said, I'm not an expert in
veterinary science, so there may be an example
out there showing contradictory evidence.
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