I have had two cats return thrown balls, although neither did it all the time.
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"Not in the mood for a fetch today, sorry"

This is amazing to know.
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It's more "I'm interested in making this cuter and easier for you" in the case of my current cat. My first one, we stopped throwing a small bouncy ball because of complaints and never started up again when we became homeowners. So no more opportunities to fetch.
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