The term PET RESTRAINT can be summarized by two crossword solutions: LEASH (5 letters) and TETHER (6 letters). A LEASH is a cord or strap that is attached to the collar of an animal, such as a dog, and held by a person to control the animal's movements. A TETHER is a rope or chain that is used to secure an animal to a fixed object, such as a post or stake, to prevent it from wandering away. Both leashes and tethers are commonly used to restrain pets.