Garfield's Thanksgiving, on CBS
IMDb; Wikia; Wikipedia

Jon invites Liz the vet over for Thanksgiving dinner. It's not that memorable. Although I did enjoy Jon talking about different Thanksgiving holidays around the world, including Japan's Labor Thanksgiving Day. This special is available on the "Garfield: Holiday Celebrations" DVD. I really should try to watch it again one of these years, to write up a better review.