gavin tobeck of washington was attacked by one-and-a-half-year-old smash while in his backyard on april 1 ; he was released late on tuesday .
during the attack , his mother 's friend dumped a cup of hot coffee on the dog to get him to release his grip on gavin .
the boy suffered from a broken cheekbone , jaw and nose bridge and lost five baby teeth and three permanent tooth buds .
smash is scheduled to be euthanized on saturday by thurston county animal service .