Puss in Boots 2 - Return of Pero (neo1024)

Once upon a time, near the ruins of an old castle, there lived the King of Cats. He was famous for his violent temper and now he is lashing out at his three gunmen, who had been ordered to bring back Pero, but had returned empty-handed. Pero, a former subject of the angry King, had lived in Cat Country once but he had dared to save a mouse from death. Now, as everyone knows, the mouse is the mortal enemy of all cats, so the King orders his three gunmen to go to the ends of the earth, if necessary, to find Pero. Pero is a happy-go-lucky sort of feline and very hip for a cat. Fleeing from the wrath of the King, he decides to seek his fortune in the wild and wooly west. On the way, he encounters the King’s gunmen hot on his trail but he foils them and blithely goes on his way. On the stagecoach to Go Go Town, he meets Annie, a pretty girl who is returning after finishing her education in the East, and Jimmy, a boy with sleepy eyes and slow movements. They are attacked suddenly by holdups who are after the new sheriff but since he does not seem to be on the coach, they ride off. Sad news awaits Annie in town....
(From http://corp.toei-anim.co.jp/english/film/return_of_pero.php)

An original story based off of elements from Puss in Boots and The Three Musketeers, but taking place in the wild west.