Resembling or characteristic of a dog; having dog-like qualities or appearing dog-like in manner.
From 'dog' plus the archaic adjective-forming suffix '-ly' (distinct from the adverb '-ly'). This is an older formation pattern that rarely appears in modern English.
The suffix '-ly' actually has two completely different functions—one makes adjectives into adverbs (quick → quickly), and one makes nouns into adjectives (prince → princely, dog → dogly)—yet we barely notice the confusion!
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