1, network connection problem: Cool dog music needs to be connected to the Internet to play music normally. If the network is unstable or disconnected, it will lead to the inability to play.

2. Copyright restriction: Some songs are protected by copyright and may not be played in some regions or platforms. In this case, the cool dog music may display the logo instead of the actual audio.

3, software failure: If the cool dog music software is abnormal, it may also lead to signs instead of actual audio.