King, whose full name is Kingarthur Van Foliny Home, has now won 47 overall best in show titles, according to The Associated Press.
The animal, named King, captured the most coveted prize at the two-day event at Madison Square Garden, besting challengers from all 50 USA states and 14 countries.
"We never had any expectation of winning the Non-Sporting Group as no Schipperke in history has ever won the Group at this show and we focused exclusively on creating a spectacular performance in the breed- level competition", she wrote.
Besides Colton, the four selected on Monday were a long-haired dachshund named Burns, who won the hound group; a Havanese named Bono, who topped the toy group; and a bouvier des Flandres named Baby Lars, who led the herding group.
There were six finalist pedigree dogs competing instead of the usual seven, because the victor of the non-sporting canine group, a schipperke, was ruled ineligible before the "Best in Show" competition began.
"After you win this magnificent competition, there's nothing more to do", Rangel said of King's future.
Two breeds of dog, the Nederlandse kooikerhondje and the Grand basset griffon Vendéen, competed at Westminster for the first time this year, having joined the sporting group and the hound group, respectively, in 2018.
After two days of strutting his stuff, King will enjoy the traditional Westminster Dog Show victory lap.
"Just overwhelming, happy. I'm so proud of this dog", Rangel told reporters when asked about King's triumph.
Colton was introduced on stage with the rest of the finalists, but wasn't eligible for judging. Last year, Flynn, a bichon frise handled by Bill McFadden of Acampo, California, won best in show.
Dog drama at Westminster: The schipperke got skipped. Brennan and Heart impressed the judge with a freestyle routine inspired by the 1956 film "The Red Balloon", which saw the dog tugging a red balloon at Brennan's command. The competition drew 2,800 dogs from 203 breeds and varieties.