. Usually, the icon of the cool dog is blue. If the icon turns black and white one day, it's to commemorate a certain anniversary, and other application icons seen on the mobile phone on that day are basically black and white, so it won't affect the user's visual experience after today. It is also because the skin color of cool dog music is set to black and white in the cool dog music settings. If you want to change the skin color of cool dog music, you can change the skin color of cool dog music according to the following steps.