An elastic dog harness comprising a back strap, an axis line vertically crossing the middle portion of the back strap, at least one leash ring located on the axis line, fixed on the back strap along the axis line, and at least one belly strap surrounding the chest of the dog vertically on the side opposite to the back strap, furthermore, a chest strap having a chest strap part crossing the chest bone surrounding the neck and/or chest of the dog, and two chest strap parts holding a moving frame, one on each sides of the axis line, the chest strap part crossing the chest bone is separated from the chest strap parts holding a moving frame by two moving frames, one on each side of the axis line, each chest strap part holding a moving frame is lined with an underlay, extending between at least the back strap and one of the moving frames, surrounding a held portion of the moving frame, while the chest strap part crossing the chest bone is threaded through the moving frames on the side opposite to the held portion on each side of the axis line, interrupting the continuity of the chest strap, and folded back on itself in the direction opposite to the chest strap parts holding a moving frame, furthermore, the elastic dog harness comprises a connecting element extending from the moving frames in the direction of the axis line, furthermore, each chest strap part holding a moving frame has at least one elastic element stretching at least partially, the maximum stretching of each elastic element is determined by a stretching limiting element, which is an extension of one of the chest strap parts holding a moving frame, threaded through one of the moving frames as a loose loop extending beyond the held portion thereof, forming a loop traversable from the direction of the back strap and the connecting element, furthermore, each elastic element is at least partially covered, loosely surrounded by one of the stretching limiting elements from the direction of the chest strap part crossing the chest bone, and each elastic element is threaded through one of the moving frames, characterized in that each chest strap part holding a moving frame, one on each side of the axis line, comprises at least one channel covering chest strap portion at least partially covering one of the elastic elements, extending beyond the elastic element in the direction of both the back strap and the belly strap, as well as starting points and one stretching limiting element, furthermore, each chest strap part holding a moving frame has a channel portion open towards the chest strap part crossing the chest bone, covered by the held portion of one of the moving frames in the rest state of the elastic element, extending from the starting points in the direction of the back strap, of a length between the starting points and an elastic element fixing zone, enclosed by the channel covering chest strap portion and the underlay, and the maximum width of the channel portion is limited by a fixing zone towards the leash ring and a fixing zone towards the belly strap, running between the back strap and the starting points, fixing together the channel covering chest strap portion and the underlay, and the primarily stretching portion of the elastic element moves in the channel portion in the direction of the chest strap part crossing the chest bone and in the opposite direction up to a length determined by the stretching limiting element, furthermore, the primarily stretching portion of the elastic element is at least partially separated from a moving loop portion by a loop portion fixing moving together with it in the channel portion, furthermore, the stretching limiting element is threaded through the moving frame through a limiting element opening (3.c), while the chest strap part crossing the chest bone is threaded through an opening for the chest strap part crossing the chest bone (3.a), separated from the limiting element opening (3.c) by a dividing element (3.b).