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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.
Luck's got little to do with it. Dogs were selectively bred for those traits.