Animal Breeding as Evolution "In Action"?

Ann Gauger's post "Is Evolution Random? Answering a Common Challenge" is an excellent answer to those who still today affirm Darwin's contention that domestic breeding offers an example of evolution "in action." But there is more to say. Alfred Russel Wallace wrote in his famous Ternate letter:

Again, in the domesticated animal all variations have an equal chance of continuance; and those which would decidedly render a wild animal unable to compete with its fellows and continue its existence...