A dog is a mammal for the following reasons:
These are the characteristics of a mammal.
Some other distinguishing features that all mammals have including dogs is the presence of sweat glands including those that are specialized to produce milk. Mammals also have a double occipital condyle: they have two knows at the base of the skull which fit into the topmost neck vertebra, and other vertebrates have a single occipital condyle. All mammalian brains posses a neocortex, a brain region that is unique to mammals.
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