Boxer Percentages Explained

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A common question we get asked is "what percentage of Boxer" is in a particular litter or pup.   
Our breeding lines were originally started with dogs that had one parent being a Boxers and the other parent another breed.  We have at times outcrossed to dogs with different heritage beyond that to help bring the size down or to improve upon the bites or help elongate the ears, increase bone density, or better the ear folds, etc.  We have been breeding Mini Boxer to Mini Boxer for sometime now, so are not doing any outcrossing to any other purebreds, Boxer or otherwise, at the present time.  So our puppies offered are typically "true" Mini Boxers.  Our puppies are not just a simple one time cross of a Boxer to another breed, but are the result of our many years of carefully blending genes together over several generations to arrive at where we are today.
We certainly can give people the mathematical percentages of what the breakdown of breeds are in any given litter's background, but that does not mean that a dog's genes have been inherited in an exact mathematical manner, in fact far from it.  Since a puppy receives one gene from each parent, the only time a true mathematical equation is correct is when one parent is one breed and the other parent dog a different breed, then the puppy is truley 50% of each.  Any breedings down from that would be anyone's guess as to how the gene's match up in subsequent generations.
So for instance, let's say one of our multi-generational litters is 37.5% Boxer, 25% Boston Terrier, 18.75% Pug, 18.75% JRT.  If there are 6 pups born, each pup can look different from the other.  We suggest that customers choose the "look" of a  particular pup that they like rather than focus on "percentages".  This should help explain it better:
This is from:
"First generation hybrids are all exactly 50% of each parent breed. Half their chromosomes from one parent, half from the other. Dogs have 78 chromosomes, so picture 39 white marbles and 39 black marbles, each colour representing a parent breed, in a large bowl representing the chromosomes of each dog.  When these hybrids reproduce, each sperm or egg will contain '39 marbles randomly picked from the large bowl'. Statistically the random mix will be somewhat evenly distributed, but it is theoretically possible though unlikely to 'pull out 39 black marbles' and also produce a purebred of either parent breed. "
If you go to that page, there is a photograph showing the example of a litter of first generation wolf/poodle crosses where all dogs look uniformly equal.  Then there is a photo of a 2nd generation cross of these 50/50 wolf/poodles and the result in the same litter are there are some dogs that look like the first 50/50 cross, some that look like poodles and some that look like wolves . . .  so even though mathematically every dog in that 2nd generation litter is "50% Poodle and 50% Wolf" in actuality, the genes in some of the dogs might be more like 75/25, etc.

Here is a video taken of two of our dogs showing the visual differences (or lack thereof) between a first generation true 50% Boxer dog and a multi-generational 18.75%  Boxer