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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. A showerthought should offer a unique perspective on an ordinary part of life.
Luck's got little to do with it. Dogs were selectively bred for those traits.