In the past, we have covered plenty of fancy robot dogs for business and research. Need one for your own DIY projects? This 12DOF Raspberry Pi Robot Dog is worth a look. It measures 53cm long and 30cm tall and can operate for up to 2 hours on battery.
This robot dog comes with remote control but the advanced version has app control. It can walk in parallel and diagonally. You can find out more about it here.