During my undergraduate degree, I studied colonial art in Oceania, which evolved into a focus on dogs in Gauguin's paintings.
His Tahitian dogs tended to be the same body style: mid-sized, slender, short-haired, with semi-erect ears and almond eyes, brown or black in color.
I remember unearthing several journal articles deep in the library regarding the natural progression of mixed-breed dogs to return to the body type painted by Gauguin. If you've gone to a shelter to adopt a dog, or been places with unchecked populations of stray dogs, you've seen plenty like it.
Arearea, 1892
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Given more time to shed traits provided by colonists' European breeds, there is a theory that dogs eventually shift towards prick ears, mid-length hair, a curlier tail set, like a coyote/Carolina dog/basenji/dingo/New Guinea singing dog/Telomian/Norwegian Lundehund...pick your continent. Besides physical traits, they bark less and only go into heat once a year.
This Wikipedia article on the Indian pariah dog covers some of it.
https://en.wikipedia.org/wiki/Indian_pariah_dog
Anyway, not chickens but seemed relevant. I'll dig up some tax shortly.