Dogs that are a mixture of different breeds, or more broadly, anything that is a mixture of different types.
From Middle English 'mongrell,' possibly from Middle Low German 'Mengerei' (mixture). The word entered English around the 15th century, originally neutral but later took on some negative connotations.
Famous mongrel dogs like mutts are actually healthier than purebreds because genetic diversity from mixed breeds reduces inherited diseases—so mongrels might be the superior dogs after all!
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