I downloaded the cool dog ringtone, why not?

If it is downloaded to the computer, look for it in the default download of Cool Dog Settings.

If it is downloaded and sent to a mobile phone, you have to call 10086 to confirm whether GPRS is enabled. If so, you have to check the GPRS connection settings of your mobile phone to see if you can send and receive MMS normally. If there is no problem above, it is impossible to receive it.