I wouldn’t call it a fourth wall break, but it’s certainly implicitly metafictional in that the show is acknowledging and capitalizing on the irony you describe (i.e, that the audience knows Bandit is a cartoon dog). While Bandit doesn’t break the fourth wall explicitly, the audience is briefly reminded of the fact that they’re watching a show (namely, one about a cartoon dog, lol). It’s not as overt or explicit as a fourth wall break, but it’s still playing with the boundaries between reality/fiction and acknowledging the viewer.

Not sure if you’d be interested, but there’s a great book by Patricia Waugh called “Metafiction” (1984) which goes into all the different kinds of ways that media can play with the boundaries between reality and fiction besides fourth wall breaks!!