ḱwon-

The PIE word for dog, *ḱwon-, is a root noun with an alternating stem (nominative *ḱwṓ, accusative *ḱwónm̥, genitive *ḱunós) that preserves one of the most archaic morphological patterns in Indo-European. The phonological correspondences across branches are fully regular, and the word is attested without exception in every major IE language family. Latin canis ("dog") shows the expected centum treatment of the initial palatal *ḱ- as c-. Derivatives include canine, kennel (through Old French chenil, from Latin canīle), and canary (the Canary Islands were named for their dogs, not their birds — Canariae Īnsulae, "Islands of the Dogs"). Greek kýōn (κύων, genitive kynós) preserves the root noun morphology with particular clarity. The genitive kynós underlies cynic (Kynikós, "dog-like" — the Cynic philosophers, so called for their ascetic, dog-like existence), cynical, and the prefix cyno- in cynophobia. The constellation Canis Major (the Great Dog) contains Sirius (Seírios), the "dog star." Sanskrit śvā (nominative, from *ḱwṓ with regular satem palatalisation) and the genitive śúnas (from *ḱunós) show the alternating stem precisely. The Vedic compound Śva-pāka ("dog-cooker," a term for an outcaste group) demonstrates the social significance of the dog in early Indian society. In Germanic, *ḱ- > *h- (via Grimm's Law applied to the centum-merged velar), yielding Proto-Germanic *hundaz: Old English hund (Modern English hound), German Hund, Old Norse hundr, and Gothic hunds. The Modern English word dog (of uncertain etymology, possibly from a pre-IE substrate language) displaced hound as the generic term, with hound becoming specialised for hunting dogs. Lithuanian šuõ (genitive šuñs) shows the satem treatment *ḱ- > š-, and Old Irish cú (genitive con) continues the Celtic reflex. Armenian šun preserves the form with the expected satem shift. The universal attestation of *ḱwon- confirms that the domestic dog was part of PIE culture — one of the earliest and most secure inferences of linguistic paleontology. The dog was evidently domesticated before the dispersal of IE-speaking peoples, and its name was stable enough to survive unchanged through millennia of independent development.