Two sets of genes can be inherited at this location known as Ky and Kbr. The Kbr gene is known as the brindle gene and is dominant over Ky.  If they inherit one or two brindle genes Kbr then they will express brindling. But there is an exception….of course. We will see this exception on the a locus. Make sure to learn about brindles here. The Ky gene is known as the allowing gene. This means when two ky alleles are inherited it allows the A, D, and B locuses to determined the coat color of the Frenchie. Kbr interferes with these colors and you will see the brindling in them as well. You can think two ky alleles (ky,ky) produces solid pups and one or two brindle genes will add the brindling. Typically when someone says brindle they are referring to black brindle as we will for this article. But be aware that many of the other colors can have brindling in their coat such as lilac and blue. 

Realize they can have varying amounts of white  on them as well such white down the nose, on the neck, chest, and toes.