They have names that could make a random password generator cry uncle. Meet, for example, GCHG CH Calicops Sassafras Gonnakikurass. “She’s a saucy girl. Her name says it all,” Fred Ortiz said as he groomed the Brussels griffon to compete Monday at the Westminster Kennel Club dog show.

Westminster Kennel Club Dog Show features more than 2,500 dogs from around the world competing for the coveted title of Best in Show.

Louis, a 7-year-old whose full name is GCHP Sunlit’s King of Queens, showed no signs of nerves. He eyed interlopers at a haughty remove. He yawned in the face of commotion. “This dog is the most confident Afghan hound I’ve encountered in my entire life,” Ms. Jones said.

Here's a list of every Best in Show winner at the Westminster Kennel Club Dog Show ahead of the 149th annual event this week.

Day 1 of the 149th Annual Westminster Dog Show did not disappoint—hundreds of dogs across four different breed groups strutted their stuff on Monday in hopes of keeping their Best in Show dreams alive.

In semifinals Monday night at Madison Square Garden, judges so far have chosen a bichon frise known as Neal; a shih tzu called Comet, who was a finalist last year and