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BIEWER TERRIER HEALTH

100% Normal          50% Carrier          100% Carrier
                                       50% Normal




50% Carrier            50% Affected       50% Affected         
50% Normal           25% Carrier           50% Carrier                                                    25% Normal




100% Carrier          50% Affected          100% Affected
                                            50% Carrier

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Normal





Carrier





Affected

Normal                    Carrier                   Affected

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GENETIC DISEASES

DNA/Genetic testing on breeding stock is something that the BTCC doesn't take lightly. The best way to produce healthy, happy puppies is to ensure that their parents are genetically sound. Nothing is ever 100% guaranteed in nature, but DNA testing of breeding prospects assists breeders in making informed decisions on breeding pairs.

AUTOSOMAL RECESSIVE MODE OF INHERITANCE CHART

CONGENITAL OR DEVELOPMENTAL DISORDER

Patellar Luxation is a condition in which the kneecap is displaced or dislocated from the knee joint where it belongs. Unilateral (only one kneecap is out of place) or Bilateral (both kneecaps are our of place) cases can be presented. This condition is common in all toy breeds, and may be a condition the dog was born with (congenital) or may it develop later in life (developmental).

ORTHOPAEDIC FOUNDATION FOR ANIMALS RATING SCALE

FOR PATELLAR LUXATION

 GRADE 1

 

The patella easily luxates manually at full extension of the stifle joint, but returns to the trochlea when released.

 

 GRADE 2

 

There is frequent patellar luxation which, in some cases becomes more or less permanent.

 

 GRADE 3

 

The patella is permanently luxated with torsion of the tibia and deviation of the tibial crest of between 30 degrees and 50 degrees from the cranial/caudal plane.

 

 GRADE 4

 

The tibia is medially twisted and the tibial crest may show further deviation medially with the result that it lies 50 degrees to 90 degrees from the cranial/caudal plane.