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Genetics of colour in Newfoundlands


The genes found in black Newfoundlands 
 

1)    AABBDDSStt

Black dog, whose offsprings are all black. The colour of the mated dog does not have any effect on the phenotype of the puppies. T-set can be tt, TT or Tt, as the spotting or lack of spotting cannot be seen on the dog.

2)    A-B-D-S-T- (or tt)

As with the previous case, the dog is completely black, but depending if the gene marked with the line is A/a, B/b, D/d, S/s, the dog can pass on recessive genes. Most dogs have this gene combination. The different possibilities are further explained in parts 3-6. 

3)    A-BbD-S-T- (or tt)

Black dog, but who has the brown allele and can produce brown offsprings with a partner who has Bb (phenotypically black) or bb (phen. brown). Normal. 

4)    AatB-D-S-T- (or tt)

Black dog, who carries the black and tan-colour. Can produce black and tan coloured offsprings with Aat-dog. Rare. 

5)    A-B-DdS-T- (or tt)

Black dog, who has the dilution gene which produces grey and beige colour. Can produce grey and beige offprings with a dog who has Dd or dd. Rare.  
    6) A-B-D-SspT- (or tt) 
Black dog who carries the allele for the landseer-colouring. If the mated partner is landseer-coloured or also carries the allele for the colour, the offsprings can have landseer colours. You can see the spotting on landseer-coloured dogs, so the T-set affects the degree of spotting seen on the dog.
 

 The genes found in brown Newfoundlands

    1) AAbbDDSStt 
Brown dog, whose offsprings are all one coloured. If the mated partner is black and white or black, the offsprings can be black. If the partner also has the b-allele, the offprings can also be brown. Two browns with no dilution genes, will always have brown puppies. 
    2) AatbbDDSStt 
Brown dog, whose offsprings cannot be black and white, but if the mated partner has the At-allele, the offprings can be a.) brown and tan-coloured (if the partner has At-allele and b-allele) or b.) black and tan-coloured (if the partner has At-allele and B-allele). Extremely rare. 
    3)A-bb-DdSStt 
Very rare brown dog, whose offsprings can be beige (also known as isabella), if the mated partner has at least one b-allele and one d-allele.
    4)A-bbD-Ssptt (or TT) 
Brown dog, whose offsprings can be brown and white, if the mated partner is landseer coloured and has Bb-genes or if the partner is a black dog who carries Bb and Ssp-genes or a brown dog who has bb and Ssp-genes. The spotting depends on the T-set.
 

 The genes found in black and white Newfoundlands
    1) AABBDDspsptt 
Black and white dog who does not have any spotting. If the mated partner has one sp allele, part of the offsprings will be black and white, part black. Two black and whites are always black and white. No offspring can be brown, grey or brown/black and white. Dogs who have tt-sets have no spotting. Dogs mated to TT-dogs always have spotting, and dogs mated to Tt-partner will have some offsprings who have spotting, some who don’t. 
    2)A-BbD-spsptt 
Black and white dog who does not have any spotting. The offsprings can be brown and white, if the mated partner has sp and b-alleles. The spotting depends on the mated partner in the same way as in the previous case. If the partner is B-S, the offsprings can be black dogs in the same way as in the previous case. Not very common. 
    3)AatB-D-spspTT 
Black and white Newfoundland who has spotting. If the mated partner is AatSsp, the offsprings can be tricolour: white with black and tan-markings and spotting. Rare. 

    4) A-B-DdspspTt 
Black and white dog with spotting. The offsprings can be grey, if the mated partner has SS and d-alleles. If the partner has sp and d-alleles, the offsprings can be white and grey. Rare. 


 

 

(c) Salmelin