Domestication has vastly enhanced the reproductive output of crop plants, livestock, and pets far beyond that of their wild progenitors.
Dingoes have been wild in Australia for more than 3, years and retain the smaller brains of their domesticated ancestors.
It was not until 11, YBP that people living in the Near East entered into relationships with wild populations of aurochsboar, sheep, and goats.
The Single Genetic Regulatory Network Hypothesis claims that genetic changes in upstream regulators affect downstream systems. A study going on since has been trying to recreate the change from wolf to dog, looking at foxes. Cats seem to have come into our lives this way, lured by the grain-eating rodents that accompanied the earliest farmers in the Middle East some 12, years ago.
Those animals established a commensal relationship with humans in which the animals benefited but the humans received no harm but little benefit. And it was probably advantageous for domestic animals to have reduced sensory acuity. In the wild there is no artificial selection so dog domestication definitely took a lot longer