Dogmatix is a fictional white terrier dog who is a companion to Obelix in the Asterix comics. Dogmatix is a pun on the words dog and dogmatic. In the original French, his name is Idéfix, itself a pun on the French expression idée fixe meaning an obsession.

Asterix is a bande dessinée comic book series about a village of indomitable Gaulish warriors who adventure around the world and fight the odds of the Roman Republic, with the aid of a magic potion, during the era of Julius Caesar, in an ahistorical telling of the time after the Gallic Wars.