Dexter's Laboratory: Season 2, Episode 36
Blackfoot and Slim/Trapped with a Vengeance/The Parrot Trap (22 Apr. 1998)
Dexter and Dee Dee are unknowingly the focus of a "Wild Kingdom" type animal documentary. During Dexter's bathing ritual, he realizes he's being observed, runs, gets tranquilized, and upon awakening discovers he's been tagged.