"The dog just came over and sniffed my cousin, Josh, and bit me," said the boy, Asher Magnuson.
Asher's father, Erik Magnuson, says it all happened so fast right after they arrived at Cargill Pond in Burbank.
"Grabbed our fishing poles, walked 15 feet from the vehicle, and that's when the dog ran up and bit my son," he says. "Fifteen to 20 seconds, it happened that fast."
The dog had been running loose with its owners, who were visiting from Spokane.
"I ended up drawing my firearm ... and the dog ran off, and I yelled at the people get your dog on the leash," says Erik Magnuson. "When I told these people that the sheriff's department was on the way, they got in their vehicle and took off with a high rate of speed."
Walla Walla County deputies caught up with the couple on the highway, but they were only issued an infraction because dog bites aren't a criminal case in that jurisdiction, KEPR-TV reports.
There was no additional ticket for fleeing the scene. The couple was also allowed to leave with their dog. Deputies said it's up to the owners to report any signs of aggression in their own pet.
That's not much comfort for the father of the 8-year-old, who ended up in the emergency room with puncture wounds.
"People who are going to take their animal and run away from this type of thing, what are the chances of them following up letting us know? That's concerning to me for my son," said Erik Magnuson.
Doctors say it's likely Asher will have a permanent scar.
"He bit me for no reason. All I was doing was holding my fishing pole," he says.