Partysaurus Rex
video.disney.com/watch/partysaurus-rex-4cb5aeaed8df6adddc0f952d
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Toy Story's Rex, the green dinosaur, gets a chance to shed his party-pooper past in DisneyPixar's new animated short.