Explanation of Health Tests... Masterkarn does testing with a conscious mind without destroying the breed...Check out our hip and elbow scores, no heart or eye problems. We only have carriers or clear vWD, no affected Vwd GP's or Dobermanns in our breeding program.


Breeding Strategies

VetGen's DNA test findings can be extremely valuable when developing and implementing your breeding plans.

Interpreting Your DNA Test Results for Autosomal Recessive Diseases

There are three possible test results: Clear, Carrier, and Affected. Below is a description of what each result means to you as a breeder.

This finding indicates that the gene is not present in your dog. Therefore, when used for breeding, a Clear dog will not pass on the disease gene.

This finding indicates that one copy of the disease gene is present in your dog, but that it will not exhibit disease symptoms. Carriers will not have medical problems as a result. Dogs with Carrier status can be enjoyed without the fear of developing medical problems but will pass on the disease gene 50% of the time.

This finding indicates that two copies of the disease gene are present in the dog. Unfortunately, the dog will be medically affected by the disease. Appropriate treatment should be pursued by consulting a veterinarian.

Affected (In the case of vWD Type l**)

This finding indicates that two copies of the disease gene are present in the dog. These dogs always have a potential to bleed given the right circumstance and will always pass on the disease gene (mutation) to their progeny. Please see the following page, for more detailed information. Also, inform your veterinarian and consult with him/her regarding this test result.
** In the case of Type l vWD - All puppies will be genetically Affected (see "Notes" below).
Helpful Canine Breeding Chart

The chart provided below outlines the implications of various breeding pair combinations. Remember, it is always best to breed "Clear to Clear". If followed by all breeders, these strategies will ensure a significant reduction in the frequency of the targeted disease gene in future generations of dogs. However, to maintain a large enough pool of good breeding stock, it may be necessary for some breeders to breed "Clear" to "Carriers" (see below).

Clear Male  x Clear Female 100% Clear 
Clear Male x Clear Female = 100% Clear.
Ideal Breeding Pair - Puppies will not have the disease gene (neither as Carrier nor as Affected).                                                                                                                                                                             
Clear Male to carrier Female = Breeding Is Safe
No Affected puppies will be produced. 50/50 clear and carrier produced
However, some or all puppies will be Carriers.Accordingly, it is recommended that Carrier dogs which are desirable for breeding be bred with Clear dogs in the future, which will produce 50% carrier and 50% clear animals, to further reduce the disease gene frequency. These offspring should be tested by VetGen's test for this defective gene, and if possible, only the clear animals in this generation should be used.​

Carrier Female to Carrier Male = 50/50 Carrier/Affected
Unwanted and not a recommended breeding.​
High Risk Breeding - Some puppies are likely to be Carriers and some puppies are likely to be Affected. Even though it is possible that there will be some clear puppies when breeding "Carrier to Carrier", in general, neither this type of breeding pair nor "Carrier to Affected" are recommended for breeding.​

​​Affected Male x Clear female = ​Carrier/Clear 25/50/25 = Clr./Carr./Affctd.
Testing required to keep only a clear if there is one. The percentage can vary in all the breedings with exception to the Clear to Clear breedings.​ NOT a recommended breeding it will produce affected pups.

Affected Female x Affected male = 100% Affected

Breeding Not Recommended - All puppies will be genetically and medically affected.


The breeds who have vWD Type 1 and where a DNA test is currently available are:

Bernese Mountain Dog, Coton de Tulear, Doberman Pincher, Drentsche Patrijschond, German Pinscher, Kerry Blue Terrier, Manchester Terrier, Papillon, Pembroke Welsh Corgi, Poodle and Stabyhoun.