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Humans were lucky that it worked out that bigger dogs generally are less mean.
(lemmy.whynotdrs.org)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
But dogs started out relatively big and we made the smaller ones after they'd already been domesticated