Thanos — the Marvel universe's purple apocalypse in a gauntlet — is one of the clearest pop-culture naming signals a pet owner can send. There is no ambiguity here, no multiple readings. If you named your dog Thanos, you are a Marvel fan who watched Avengers: Infinity War and thought: yes, that's my boy.
MCU Peak and the Villain Name Wave
Thanos peaked culturally in 2018-2019 with Infinity War and Endgame, and the name followed that wave into pet registries across the country. It sits at the extreme end of the villain-name-for-pets aesthetic, further along the spectrum than Loki (who at least got a redemption arc) and substantially more committed than Dexter. The name works best on large, imposing breeds: Rottweilers, Great Danes, Cane Corsos.
The Cosmic Joke Dimension
Thanos on a small dog — a Chihuahua, a Pomeranian — is a different kind of choice entirely: pure comedy, maximum irony. The gap between the name's apocalyptic weight and the dog's actual threat level is the entire point. Both readings (sincere tribute and ironic comedy) are legitimate.
The Counter-Reading: MCU's Cultural Half-Life
Pop culture villain names age with their source material. Thanos will remain legible for years given the franchise's reach, but the name will increasingly read as a specific timestamp rather than a living reference. For the same cosmic energy with mythological staying power, Ares or Titan survive franchise changes intact.