If you’ve not been beavering away at Konami’s Metal Gear Solid V The Phantom Pain for hours on end then you might be missing the following to change the fur colour of the attack dog D-Dog or DD. The key to unlocking these aside from spending lots of time playing is levelling up the bond level between you and the character which is done by completing missions with them – you can see the level up status on the results screen after beating a mission.