Abstract: A dog harness assembly comprising: a harness body adapted to be positioned on a chest portion of a dog, a pair of restraint loops coupled with the harness body and adapted to pass respectively under the left and right foreleg pits of the dog, each loop comprising a clasp adapted to be releasably fastened to a fastening arrangement provided in the harness body; a connector located in the harness body for engaging with a locking portion of a leash for allowing a user to exert a force for controlling movements of the dog wearing said harness when the harness is connected to the leash through said connector; a key or combination actuated locking arrangement coupled with said connector to provide a lockable connection between the leash and the harness wherein in a locked configuration the leash connector is prevented from being uncoupled from the connector; wherein the locking arrangement is coupled with said fastening arrangement such that in the locked configuration the clasps of the restraint loops engage with