It seems that the buckskin colored horse that Ben Cartwright rode in Bonanza was the same horse that was used by Marshal Matt Dillon in the series Gunsmoke.
No, Matt Dillon's horse was not named Buck. In the television series "Gunsmoke," Matt Dillon rode a horse named Buck. On "Bonanza," the character Ben Cartwright, played by Lorne Greene, had a horse named Buck as well. So while both shows featured a horse named Buck, they were not the same horse and belonged to different characters.
buck
Gunsmoke - 1955 There Was Never a Horse 4-35 was released on: USA: 16 May 1959
Gunsmoke - 1955 Blue Horse 4-38 was released on: USA: 6 June 1959
A horse
Eric "Hoss" Cartwright's horse's name was Chub.
Quarter horse.
James Arness
I believe it was a buckskin
A Matter of Circumstance.
Hoss (Horse - as in big as...)