Radio Control Mecha Dog (ラジオコントロール メカドッグ) is an RC robot dog sold by SK Japan.
The dog has a pair of red, LED lights behind its black visor, a very long tail, with a silver, spherical tip, and a pair of elliptically-shaped ears. The robot dog is silver and has speaker holes on its chest. It has a black nose, a black neck, and black feet. Each ear has a black, fake screw that looks as if it keeps the ears attached to its head, and a fake, black screw on its left and right back legs. The dog also has circular indents on its muzzle, for where its whiskers would be, if it had any.
You can use the remote to make it bark, as the lights in its visor flash, and control the direction it moves in. You can make it move back and forth, and turn.
Other images on this webpage came from another Mercari listing, which Ninten110 spotted, years ago.