Take another look at the sentence:
My cat Buster leapt onto the wobbly table to escape Oreo, the dog, who ran in tight circles, trying to bite Buster's tail, which hanged over the side.

The third verb, hanged, is incorrect. This sentence requires the simple past. Hung is the right form. Hanged means to to die by being suspended by the neck.

Verb Simple
Present
Simple
Past
Past
Participle
hang hang(s) hung hung

Leapt, the verb you chose, is perfectly correct. Before you continue, review the rules for irregular verbs.

Try again to become a champion!