Delete/re-install the DOGTV App. When you download the app, temporarily disable the WIFI on your phone/other devices. Sometimes if an app is downloaded on a less than stable Internet connection, this can cause it to behave erratically.

1.  Delete the DOGTV App

2.  Restart your Apple TV (Settings > System > Maintenance > Restart)

3.  Disable the WIFI on your phone/laptop/desktop (leave Apple TV WIFI on)

4.  Reinstall the DOGTV App

5.  Open the DOGTV App and select 'Watch Live'.