More dog-like or characteristic of a dog in behavior, appearance, or quality (comparative form).
From doggy/doggie (resembling or relating to a dog) plus the comparative suffix -er, making it the comparative degree like 'bigger' or 'smaller'.
When you add -er to an adjective, it makes the comparative form—so 'doggier' means 'more like a dog' than something else, which is great for comparing two dogs' personalities!
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