The Bulldog, or Clyde, was an occurring character in Tiny Toons Adventures that only appeared in the early episodes of Season 1. Unlike other Bulldogs like Hector he was loosely based on, Marc Antony and Barky Marky, this Bulldog is more of an antagonist.
The Bulldog first appeared in The Wheel o'Comedy in the episode "Optical Intrusion" where when Furrball came into the junkyard when trying to get the glued 3D glasses off was confronted and devoured by the Bulldog who's guarding the premises, even after a few hijinx before the 3D glasses were removed, only to be stuck on the Bulldog.
In Test Stress episode "To Bleep or Not to Bleep", the Bulldog appears again, confronting Fowlmouth and Shirley in the park. As Fowlmouth tried petting him to prove him harmless, the bulldog bites his hand, almost causing Fawlmouth to bleep at him before Buster pulled the Bulldog into the trashcan he's hiding in and dressed him into a baby that halted Fawlmouth's bleeps. No soon as they went away, Buster took out his pacifier that made him cry like a baby. A flashback clip of the Bulldog biting Fowlmouth's hand made a cameo in the Season 3 episode Weekday Afternoon Live.
In Life in the 90s episode "Paper Trained", the Bulldog chases Buster while doing his paper rounds, switching places when travelling through a covered bridge and pipe until the Bulldog was growling at Buster on the handlebars. Buster detaches the handlebars from the bike which caused the Bulldog to crash into a brick wall, and his flat body to flutter on top of a pile of other flattened dogs with Buster saying "We lose more pooches that way."