My Parents Gave Us Their Couch. Their Dog Must've Peed On It. Smells Horrid Any Suggestions To Remove The Odor

Basically My Parents Are Getting New Furniture-- Theirs is Only About 2 Years Old And Having Just Moved Into A New Home Thought Hey Free Why Not... Well Moved It Into The House Yesterday And Noticed Once Arranged There Was A Pungent Odor.. Must Have Been That Their Husky Peed On It-- My Mom Just Removed All Stuffing and Washed Covers To Everything So Im Not Sure If It Is On The Base of The Couches.. Being A Sectional Sofa It's Hard To PinPoint The Location-- As I Have No Clue When Happened Or Where. Just Getting Ideas Or Suggsetions Please As How To Remove The Odor! THANKS