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Chain Chomps are spherical creatures that seem to take the role of dogs in the Mario universe. In Mario games they are often chained to poles and invincible. In Super Mario 64 there is a Chain Chomp in the first stage.
The Chain Chomp first appears in the episode Dreams, recolored as Pac-Chomp. He has since made some other appearances, with Super Mario 64 Bloopers: Who let the Chomp out? being his biggest appearance and role. It also appears in the sequel to said episode, SM64 Bloopers: Who let the chomp out...AGAIN!?.
It appears as a cameo in SMG4 Christmas 2019: Mario Alone.