Initially Boyd competed both in North American and international promotions as part of the Royal Kangaroos with his cousin Norman Frederick Charles III.

Their opponents included the Yamaha Brothers (Kantaro Hoshino and Kotetsu Yamamoto), Seiji Sakaguchi, Osamu Kido, and Antonio Inoki.

In September 1976, they defeated Pat Patterson and Tony Garea for the NWA World Tag Team Championship; they lost the titles to the Valiant Brothers in November 1976.

On 22 August 1978, Boyd defeated Ed Wiskoski to win his third NWA Pacific Northwest Heavyweight Championship.

Boyd reigned for six months until he was defeated by PNW's fastest rising star "Rowdy" Roddy Piper.

His first stop after leaving the Oregon/Washington territory was due south to the Los Angeles, California-based NWA Hollywood Wrestling promotion, where he teamed up with Coloso Colosetti to defeat Barry Orton and Héctor Guerrero to win the NWA Americas Tag Team Championship on 18 May 1979, only to lose the title to the Twin Devils the next day.

At the time, Miller and Williams were the NWA North American Tag Team Champions in the Puerto Rican Capitol Sports Promotions.

The duo of Boyd and Williams quickly gained a reputation of one of the most violent, hard hitting teams in the business.

One act that made the Sheepherders the most hated men in Southeastern Championship Wrestling was when they attacked and injured (storyline) Jimmy's father Billy Golden.

[9] Showing how incredibly resilient the duo was, they returned to the ring later in the night and defeated the territory's main stars Jerry Lawler and Bill Dundee.

[4] The matches started out pretty evenly with the Fabulous Ones and the Sheepherders splitting the decisions[11][12] but soon turned brutal and often without a definite winner.

In late 1982, the Sheepherders won the AWA Southern Tag Team Championship from Lane and Keirn[5] which only turned the intensity of the matches up a notch.

Their first target was the reigning SCW Southwest Tag Team Champions "The Grapplers" (Len Denton and Tony Anthony).

Shortly after debuting, the Sheepherders won the gold from the duo through nefarious means: before the match Williams and Boyd had bribed the Grapplers' manager Don Carson and promised he would become a tag team champion; Carson turned on the Grapplers mid-match to ensure the Sheepherders' victory.

Instead of taking the titles from the Sheepherders by stripping them, the Fabulous Ones took the AWA Southern Tag Team Championship from them the old fashioned way – four times in a row between 5 September and 12 October.

In the winter of 1985, the Kiwi Sheepherders and the Fantastics traded wins back and forth[15][16] with no side gaining a clear advantage in their feud.

[19] The loss to the Fantastics only intensified the Sheepherders' anger, bringing the feud to its high point as the two teams clashed in a "No DQ Loser Leaves Town" match on 20 January 1986.

[5] On 28 December of that year, Boyd won his last title when he defeated Joe Savoldi for the IWCCW Heavyweight Championship.

[5] On 25 December 1989, "Lord" Jonathan Boyd lost to Rex King in his retirement match in Portland, Oregon for the same promotion that gave him his first break in the United States, Pacific Northwest Wrestling.

[24] His final match took place on August 10, 1991 in Portland, Oregon, in Pacific Northwest Wrestling where he went to a double count-out against The Grappler under the ring name "Johnny Miller".