Reggie, a 7-year-old Great Dane from Idaho, and Pearl, a 4-year-old Chihuahua from Florida, put their (size) differences aside for a day of fun.

Guinness World Records shared video from the historic meeting between the world's tallest living dog -- standing 3 feet, 3 inches tall -- and the world's shortest dog, who stands at 3.59 inches tall.