Hi Mark,
I think this was your man,
David Canary ... 'Candy' Canaday (84 episodes, 1967-1973)
Hi Keith:
Small correction - that's not David Canary in the above pic with Ben, Little Joe and Hoss.
That's a character named Jamie Hunter Cartwright (Mitch Vogel) who appeared on the series from 1968-1973.
Candy was a ranch hand - here is is pictured with Lorne Greene.
Mark