2001 March 20, Jen, “Re: Which is the best dog for our family?”, in rec.pet.dogs, rec.pets.dogs.breeds, rec.pets.dogs.rescue[1] (Usenet):
I'm sure whatever breed you choose, or unbreed (mutt) it will lead a happy life with you.
2005 — Julia Szabo, The Underdog: A Celebration of Mutts, Workman Publishing (2005), →ISBN:
They are a generic, a noname animal, the unbreed, one of a kind, and in these days of mass-produced merchandise, of branding run rampant, the mutt's uniqueness is a priceless commodity.
2006 — "Author Praises Mixed Breeds in 'A Celebration of Mutts'", Akron Beacon Journal, 18 March 2006:
The Underdog, A Celebration of Mutts, is an ode to the shelter dog, high praise for the "unbreed."
Those unaccustomed to the principle of seeking their own advantage by means conducive to the advantage of others show overreaching suspicion and distrust: these being the vices of competition, in which they have been bred, and you cannot unbreed them very soon.
1961 — The Complete Book of Food and Nutrition (ed. J. I. Rodale), Rodale Books (1961), page 123:
It is too bad about the cow! If there were only a way that we could start to unbreed her — to breed her backwards so to speak, to progressively reduce the size of her udders so that one day again she could become a scrub cow.
1967 — Child Development: Readings in Experimental Analysis (eds. Sidney W. Bijou & Donald M. Baer), Appleton-Century-Crofts (1967), page 111:
We cannot unbreed the child and reconstitute his genes in a happier combination.
Because it is a matter of breeding, I continued, I imagine that I can unbreed her.
2005 — Tara Brautigam, "Pit bull ban? Owners and officials facing off", The Spectator, 24 January 2005:
"That's what they were bred for and you just can't unbreed that kind of stuff in an animal overnight," Ellis said.
2010 — Jenny Diski, What I Don't Know About Animals, Yale University Press (2011), →ISBN, page 256:
The standard argument against vegetarianism/veganism can't simply be dismissed, if only on practical grounds: we cannot undo what humans have done, unbreed the bred, wild the tame, uneat the eaten.
Verb: "to cause to become extinct through insufficient fertility"
1996 — William G. Hollingsworth, Ending the Explosion: Population Policies and Ethics for a Human Future, Seven Locks Press (1996), →ISBN:
[…] if subreplacement fertility lingered on and on and on […] a nation would finally unbreed itself into actual extinction.
1997 April 18, Ashkelon [username], “Re: Homosexuals Choosing Celibacy *cough*”, in soc.singles[2] (Usenet):
Unbreed yourselves out of existence, and let this world continue on its path, which, although strewn with dead-ends, leads us towards more meaningful challenges.
2004 — Ben J. Wattenberg, Fewer: How the New Demography of Depopulation Will Shape Our Future, Ivan R. Dee (2004), →ISBN, page 16:
(No, I don't think the human species will unbreed itself out of existence.)
2007 July 8, Ace DeSone, “Saw 'Idiocracy' -- finally!”, in misc.writing.screenplays.moderated[3] (Usenet):
The premise of "Idiocracy" is simple enough: Set 500 years in the future, stupid people have continued breeding while smart people waitfor the "time to be right," so the smarties unbreed themselves out of existence, to the point where an average guy (with an IQ of 100) in our time, wakes up in the future and is the world's smartest man.
[…] I say let 'em unbreed themselves, and stop forcing therapy drugs on the pleasure-centered."
1991 — Kenneth Craig, The Arab Christian: A History in the Middle East, Westminster/John Knox Press (1991), →ISBN, page 208:
In the 1970s it was different, and there was no feasible Shihāb to hold the ring and unbreed suspicion.
2001 — Rebecca Ann Bach, "Tennis Balls: Henry V and Testicular Masculinity, or, According to the OED Shakespeare Doesn't Have Any Balls", in Renaissance Drama, New Series XXX, 1999-2001, Northwestern University Press (2001), →ISBN, page 6:
The French impoverish their masculinity by pouring out their "treasure," but Henry's arousal will unbreed the French as it proves him a son of an Englishman, a nephew of an Englishman, and a father of a son.