Here is the sentence:

Madison slept at the very edge of the bed, one leg dangling over the side, because Yo-Yo, her little dog, lay stretched out in the middle of the quilt and bitt any limb that invaded her territory.

The third verb, bitt, is the problem. As you know, the sentence requires the simple past. Bit is the correctly spelled form.

Verb Simple Present Simple Past Past Participle
bite bite(s) bit bit or bitten

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