Not at all meeting the rhyme criterion but fits with her high jumping: Pogo.
Closer to the rhyming thing: Ricochet (Rickie for short)

I wouldn't worry too much about making the name rhyme for the sake of the dog. Years back we adopted a 16-month old shepherd-lab mix, named Norman after a horror movie character. Within a day he understood very well that when we said "Rudy" good things happened to him--food, love, walk, fetch.