I just learned that a puppy I want to adopt has something called "swimmers" leg...has anyone heard of this?

Answers:
No it's not a cramp! It a congenital defect. Just google swimmers syndrome in puppies and it will give you all kinds of information about this condition.
Some pups do well with this if it's not sever some don't.

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have never heard of that in a dog- swimmers (humans) get it- its a cramp.