Genes explain why Chihuahuas are so high-strung

A handful of genes could mark the difference between high-strung Chihuahuas and unflappable basset hounds. A comparison of 148 dog breeds has uncovered genes for size, lifespan, and even complex behaviours such as pointing and herding.

Geneticists have previously uncovered genes for dog traits such as coat colour and narcolepsy, but these searches tended to focus on a single breed, comparing pooches with variations in a single trait – for example, boxers with and without white spots.”*

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