Genesis Chapter 1. Created and reproduce after their KIND.
Variation based on already inherent genetics, nothing new under the sun.
Mix dogs of all sorts over a few generations and you get a Dog Dog. It will have the ability to produce and make more......Dogs; then selectively breed for traits and you’ll get big dogs, little dogs, shorthairs, long hairs, droopy ears, tall ears.....all with long tails....But that ain’t evolution.
My dog Rayol is a default dog. Mixed breed, 30 lbs. looks like a coyote with a curly tail.