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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.
buck
Gunsmoke - 1955 Blue Horse 4-38 was released on: USA: 6 June 1959
Gunsmoke - 1955 There Was Never a Horse 4-35 was released on: USA: 16 May 1959
A horse
Quarter horse.
Eric "Hoss" Cartwright's horse's name was Chub.
Ben Cartright
A Matter of Circumstance.
Hoss (Horse - as in big as...)
I believe it was a buckskin
James Arness