The sport of dog surfing is riding high.

The sixth annual Surf City Surf Dog competition in Huntington Beach on Sunday was the most popular in its young history – attracting approximately 2,500 people, raising an early estimate of more that $6,000 for its nonprofit partners and throwing about 65 dogs into the ocean to vie for the title of best surfer on four legs.

“This is our largest event yet,” said organizer Lisa Scolman, 50, of Oceanside. “It’s exciting to see where dog surfing is going and to see it growing and growing.”

The dogs competed among their weight classes, with categories for small, medium, large and extra-large breeds. But there were also a tandem event for canines and their humans, and the inaugural shredder category for the more advanced surfers.

“Dogs can really, really surf,” Scolman said.