Mister ranks #553 with 224 entries, registered male. The name is a maximally formal-affectionate pick — owners reaching for the English honorific and giving it to a dog or cat as a kind of running deadpan title. The pet is being addressed with mock-ceremonial respect, and the joke is sustained every time the name is called.
The honorific-as-name register
Mister clusters with Sir, Duke, Prince, Captain, and Major in the title-as-name pet-naming cohort. Owners reaching for these names are usually responding to behavior: the pet acts dignified, demands respect, refuses to be picked up — and the title codifies the personality.
Breed lean and sound fit
Two syllables (MIS-tur), front-stressed, with a soft trailing -ur that calls easily. Mister shows up disproportionately on dignified-looking breeds — Bulldogs, Dachshunds, Schnauzers with prominent mustaches, Shih Tzus, and cats with imperious facial expressions. The name lands awkwardly on chaotic-energy breeds.
The owner-cohort signal
The Mister cohort overlaps strongly with the formal-human-name pet-naming wave — the same owners who pick Charles, Winston, and Oliver. Mister adds the additional layer of the title itself functioning as the name, with no first name needed. The Mister human name page shows almost no SSA presence, confirming the pet-only register.
The Mister cohort skews toward owners with strong attachment to vintage Americana register, with a smaller cluster of owners using the name ironically as a deadpan formality. Both readings produce the same warm result.