Google Play will no longer warn you if an app developed for Android M requires the INTERNET permission. However, it's sometimes nice to know if a calculator or flashlight app requests the INTERNET permission. Permissions Watchdog helps you to determine if an app requires the INTERNET permission.
There are two ways in which the app can be triggered:
1. Right after installing an app, a notification will warn you if the app you just installed requests the INTERNET permission
2. On any Google Play app page, tap Share --> "Check permissions" to find out if an app requires the INTERNET permission even before installing it