good question, Mickey! The "F" terminology comes from any hybrid crosses between species, or breeds, whether it be red and white tulips, corn, or puppies! So the F1b is an F1 hybrid (Labradoodle) bred BACK (that's the b) to a parent breed, and usually that means a labradoodle x poodle breeding. So the F1b doodles are 75% poodle, 25% Lab, as Virgil said.
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