Watchdog

[Sarah]

A dog kept to watch and guard premises or property, and to givenotice of the approach of intruders.

[Julene]

Guard Dog to protect people. Commonly used in junk yards.

[Greta]

Watchdog is a [Minecraft] anticheat used on the [Hypixel] [network] server

[Rihanna]

A guy/girl [posted up] in a [watchtower], telling other people how to live life, how to do things, what politicians/cops/government officials/agencies are on their side, what to buy when they [go to the store], and so on.