05/29/2012 05:23 pm ET

Tank, Pomeranian Dog Who Fell Off Boat Into Chicago River, Found Safe (VIDEO)

The Chicago-area couple and owners of a Pomeranian dog who fell off their boat and into the Chicago River over the holiday weekend is breathing a sigh of relief after their pet was found safe by Good Samaritans on the city's North Side.

Tank, a blonde male, 5-year-old Pomeranian, fell off of the boat of his owners Linn and Mark Lewis, of St. Charles, Ill., Sunday and fell into the north branch of the Chicago River near Goose Island, ABC Chicago reports.

Tank was wearing a yellow life vest with "Gladiator" written on its side, his owners told NBC Chicago before noting that they usually tether him down when they take him out on a boat. This time, they did not.

The Lewises searched for their pet, who weighs less than 10 pounds, until early Monday and were working with Chicago Police and the U.S. Coast Guard, according to NBC. They had offered a $500 reward for his safe return.

On Monday afternoon, a woman in the city's Ravenswood neighborhood spotted Tank, still wearing his vest, near the intersection of Lawrence and Virginia, near the river, CBS Chicago reports. The woman could not catch the dog when she attempted to, though another woman did, and was able to take Tank into her home and feed him.

"We went from complete devastation to complete elation. We are so overwhelmingly happy," Linn Lewis told CBS of Tank's return. "We are overjoyed to have our family member back. We love him so much."

The woman who rescued Tank is a dog lover who refused to accept the Lewises' $500 reward, according to WGN.