The Truth:

No, no, no! It’s difficult enough for scientists to manipulate genetics, so how can a litter of unborn puppies carry out such an undertaking? Puppies carried within the womb cannot alter the mother’s genetic structure, and therefore, future puppies will not be affected. While pregnant, a female shares blood with her litter, but that’s all. “But blood cells carry genetic code! Couldn’t cells from the mixed litter taint the mother’s blood and affect a purebred litter?” you ask. The answer is no. If you receive a transfusion, will you suddenly morph into the donor who gave the blood? Of course not. According to Las Vegas veterinarian, Philip Caldwell, “After giving birth, the female will shed all cells resulting from the mixed breeding. Despite the mixed mating, the female will still have an abundance of eggs that contain only her genetic material and hence, are ‘pure’.” Even if her temporarily “tainted” blood from the mixed litter were somehow given to a new, purebred litter, (which cannot happen, because the female has a brand new blood supply long before she can get pregnant again) it would not change the litter’s genetic structure.