Watchdog (G1)

A Watchdog is a Decepticon from the Sunbow portion of Generation 1

Watchdog units are part of the Decepticon security net on Cybertron under Shockwave. These hovercars patrol the roads of Cybertron, going where the traditional Tetrajet cannot.

They operate in pairs.

Fiction

When Spike, Wheeljack, Trailbreaker and... some other guys... pissed off Shockwave, he sent the entire Decepticon contigent on Cybertron after them. They shook every pursuer- except the Watchdogs.

They eventually managed to evade the watchdogs by ducking into the hidden entrance to Wheeljack's lab. The Watchdogs continued past.

From Teletraan I: The Transformers Wiki, a Wikia wiki.