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'.