A watchdog is someone or something that carefully monitors others to make sure they follow rules and act responsibly. The word comes from the idea of a guard dog that stays alert and barks when something seems wrong.

In government and business, watchdog organizations keep an eye on powerful institutions to protect ordinary people. For example, a consumer watchdog group might investigate whether a company is selling dangerous products or lying in its advertisements. Journalism often serves a watchdog role: reporters investigate corruption, uncover hidden problems, and ask tough questions that powerful people would rather avoid.

You might hear someone described as a watchdog of the school budget, meaning they carefully track how money gets spent to prevent waste. Environmental watchdogs monitor pollution and press companies to follow environmental laws. The key idea is vigilance: a watchdog pays attention when others might look away and speaks up when something needs to change.

The word can also refer to actual watchdogs: dogs bred or trained to guard property and alert their owners to intruders. Whether furry or human, a good watchdog stays alert, protective, and unafraid to raise the alarm.