Who says corgis can't fly?

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Cali as Underdog - I'll save you!
(she just needs a cape and a U on her chest.)

Many corgis can jump

Though it's very important that they not be overweight and they should be x-rayed to make sure their shoulders and hips are ok.

You should wait until a corgi is at least a year or year and a half before jumping what they would normally jump (usually 8" or 12").  Some puppies are taught on little tiny jumps or poles on the ground, but get a vet's ok before doing so.  It's best to wait till their growth plates have closed.  The way to tell if they're closed is by an X-ray.