The Cisco Kid was no friend of mine but his horse was a friend of my sidekick "Andy". Andy met Diablo in San Francisco when he was army brat. Andy got a certificate to authenticate the event but lost it. Andy also met Topper, Hopalong Cassidy's horse when he came to the base. Andy claims that very few sidekicks could afford a horse of their own.
Gabby hayes: No horse
Tonto: Scout
Andy Devine: No permanent horse
Smiley Burnett: No horse
Poncho: Had horse
Pat Butrum: Nellybelle, but it was a jeep.
Chill Wills: no horse, but rode the bomb.
Andy did only a little better in remembering the horses of heros.
Red Ryder: Thunder
Lash Larue: can't remember
Tom Mix: a two horse shooter, Old Blue and Tony.
Wild Bill Elliot: not known for his horse but for always saying... ordinarily I'm a peaceful man...
Paladin: rode stage into town, then rented horse.
The Green Hornet: Black Beauty OK the Black Beauty was his car but he was the great nephew of The Lone Ranger and Andy just added this for incidental value.
And if Andy ever runs out of incidentals I will dump my sidekick and start using URL's.
