Well, why don't you find out and tell us? The article did say there's never a shortage of cops at the Adams Morgan day - right at the very beginning in fact, just before it says the dog got out of hand.
Also, the designation "K9 cop" means a cop specially trained as a dog handler, not "two or three cops" as you seemed to deduce.
“Two or three cops” was not my deduction, but the observation of an eyewitness.
Since “two or three cops” were described as being at the scene, it is clear that they decided the most important criminal matter at hand was forcibly removing one dog from its owner who was calming his dog after a common dogfight.
“The article did say there’s never a shortage of cops at the Adams Morgan day -”
Apparently there is a surplus of cops at the Adams Morgan festival, if intervening in an already broken up dogfight was important enough to draw the attention of “two or three cops”.