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Please note- the Black Coat colour is only recognised with the Presa Canario standard and not the Dogo Canario
Coat genetics
Dogs have a great deal of diversity in breeds, in all aspects, including coat color and patterns. Canine coat genetics are still being researched. Most of our present understanding of canine coat genetics is based on the work of Clarence Cook Little, author of "Inheritance of Coat Color in Dogs" (1979), although some researchers dispute some of his theories.
For those with a keen interest in canine coat genetics, an excellent source for the breeder and the layperson's understanding is authored by Dr. Sue Ann Bowling.
As far as the Presa/dogo Canario is concerned, it is believed Fawn is based on the Agouti series, specifically the ay allele. Agouti hairs are fawn hairs banded and/or interspersed with black. This gene is recessive to the other genotype of the breed, brindle.
It is known that Brindle is a dominant trait but there is some argument as to where it is located. Little postulated that it was on the E series (Ebr) but if so, would compete with the black mask (Em), which is known to not be the case. Dr. Bowling speculates the gene is most likely on a new series, which she calls "K".
The following are true in canine coat genetics: (remembering alleles come in sets of 2)
1. Breeding fawn (ayay) x brindle (KbrKbr or Kbray) may produce: fawn and brindle offspring.
2. Breeding brindle (KbrKbr or Kbray) x brindle (KbrKbr or Kbray) may produce: fawn and brindle offspring.
3. Breeding fawn (ayay) x fawn (ayay) will always produce: fawn offspring.
For breedings of fawn x brindle or brindle x brindle there is no clear way to predict the number of fawn or brindle offspring. Some litters from these breedings will be entirely fawn, entirely brindle, or, most likely, some combination of both.
