Chanticleer and Reynard

Plot
The stories of Chanticleer the rooster and Reynard the fox

Why it was cancelled
They were gonna be in a feature film by the same film after plans fail in each of the earlier attempts to bring them separately to the screen.

Results
The story of Chanticleer was later adapted in the 1991 Don Bluth film Rock-A-Doodle, which was a critical and commercial failure.