Chicken is a dog name that requires a complete absence of self-consciousness from the owner — and 71 records at rank 1,487 confirm that a modest but real population of people have exactly that quality. This is almost always an irony name, a joke name, or both simultaneously, placed on a dog who is either comically small or unexpectedly timid.
The Anti-Aspirational Name
Most dog names carry aspiration upward — toward strength, beauty, prestige, or cultural reference. Chicken goes the opposite direction deliberately. It's a name that says: we don't take this too seriously, we find our dog's personality genuinely funny, and we want a name that reflects the actual animal rather than our ideal of one. The same naming instinct produces Pickle and Noodle.
The Timid Dog Factor
A notable subgroup of dogs named Chicken are named for their personality — the dog who startles easily, runs from the vacuum cleaner, hides under furniture during thunderstorms. Calling that dog Chicken is a fond acknowledgment of a real trait rather than mockery. It tends to come from owners who find the timidity charming rather than frustrating. Greyhounds and Whippets, notoriously skittish, probably have more Chickens per capita than their popularity warrants.
Practical Reality
Calling "Chicken!" across a dog park will produce looks. Some owners find this a feature; others discover it's more friction than they bargained for. The name works perfectly in private, warmly and absurdly in most public contexts, and slightly awkwardly at formal vet visits where paperwork says CHICKEN in capitals. Know what you're signing up for.