A dog went for a swim in the Pacific Ocean and got caught in a rip tide, dragging him away from shore. Two passers-by tried to swim after him, but were also caught in the rip tide. Two kayakers had to rescue the humans. Someone had also called 911 and the police rescue boat quickly arrived on scene. The police then made sure everybody, dog and humans, made it safely back to shore.
Rip tides occur at some beaches in the Greater Vancouver area. They move you away from shore at a very quick rate and eventually you get tired, with fatal results. If your dog wears a flotation jacket while swimming, that would improve the chance of survival in an incident like this.
Water accidents happen fast and without warning. Only swim at beaches with lifeguards! Even then, the "rip current" article on Wikipedia states that in the U.S., "Over 80% of rescues by surf beach lifeguards are due to rip currents totaling 18,000 lifeguard rescues a year."
The news article calls it a "daring dog rescue." Not true! Somebody lost control of their dog and two people, unable to stand by and watch him drown, bravely risked their own lives in an unsuccessful attempt to save him. They had to be rescued, too, by other bystanders and by properly trained and equipped police.
Read "Daring dog rescue off Vancouver's Third Beach" in the Vancouver Sun
UPDATE: Florida lifeguards rescue 500 from rip currents in 3 days!