Probably the same reason that humans do.
Human babies are cute. This is not an accident. They give off signals of health, like chubby cheeks, to convince us they’re good investments. Adults in turn are wired to find their proportions uniquely endearing, so we don’t abandon them on a mountainside as soon as they start screaming.
Creatures which mimic babies’ proportions tend to register to us as cute. Domed heads, big eyes, little noses. Short neck, large head:body ratio. Neoteny.
Behold the Cavalier King Charles Spaniel. This creature has no function except as a furbaby.
Anything that triggers a species’ equivalent of an “awwwwww” reflex can get itself adopted.
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