Silver
Silver made 73 films from 1922 until 1942 and was Buck Jones' horse in approximately 50 of those films.
Cast

Blood Will Tell
Buck's Horse

Law for Tombstone
Silver (Alamo's Horse)

Outlawed Guns
Silver

The Overland Express
Silver (uncredited)

Empty Saddles
Buck's Horse

Ride 'Em Cowboy
Silver

Screen Snapshots Series 17, No. 12
Silver

Unknown Valley
Silver, Buck's Horse

Hollywood Round-Up
Silver - Buck's Horse

Gordon of Ghost City
Silver (Buck's Horse)

Shadow Ranch
Silver - Buck's Horse (uncredited)

For the Service
Buck's Horse

The Thrill Hunter
Silver, Buck's Horse

The Red Rider
Silver - 'Red's' Horse

Black Aces
Silver, Ted's Horse

Forbidden Trails
Silver, Buck's Horse

The Crimson Trail
Silver - Billy's Horse

Border Brigands
Buck's Horse

Stone of Silver Creek
Stone's Horse

The Avenger
Murietta's Horse

Riders of the West
Buck's Horse

Arizona Bound
Buck's Horse

Below the Border
Buck's Horse

The Gunman From Bodie
Silver

Riders of Death Valley
Tombstone's Horse

Down Texas Way
Silver, Buck's Horse

Dawn on the Great Divide
Buck's Horse

Boss of Lonely Valley
Silver, Steve's Horse