Stanley's Dinosaur Round-Up

Stanley's Dinosaur Round-Up is a 2005 American animated Western television film based on the Playhouse Disney television series Stanley. It was directed by Jeff Buckland and produced by Cartoon Pizza. The film is notable for being the final film role of actor John Ritter, the voice of Great Uncle Stew, who died in September 2003 and was also dedicated to his memory.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.