Eye color inheritance in dogs (labardors if possible)

Question
I have found a lot of information about coat color inheritance in labradors, but nothing useful about eye color inheritance (in dogs).  I breed chocolate show labradors and some have yellow eyes (not prefered by jueces).  Some people believe it is related to the yellow gen for hair (e alele = phaemelanina), but some yellow labs actually have very dark brown eyes.  Please, is there any web page or direction where I can find usefull information?  

Answer
Hi, It is hard to find good articles about eye color genetics.
I got this clip from a hip dysplasia site talking about genetical causes of dysplasia.

"Every cell in the body, except for sex cells, carries two copies of each gene and each gene codes for a specific characteristic. One very simple example is eye color:

If the cell's two sets of genes for a specific characteristic are exactly alike, then the animal is homozygous for that characteristic.

If the two genes are different, i.e., heterozygous, then one copy of the genes could code for blue eyes and the other could code for brown eyes.


Let's complicate the matter even further. If the animal carries two different copies of the same gene for eye color, only one copy can be expressed in any given eye. Closer to home, in humans for example, a child born to parents heterozygous for eye color (both parents have a blue-eyed gene and brown-eyed gene) will have a one-in-four chance of having blue eyes. This is because the gene for blue eyes is recessive and both copies for that code for blue eyes must be present before that characteristic can be expressed. On the other hand, if the child has brown eyes, we don't know what type of genes for eye color he or she has. This is because the gene for brown eyes is dominant and is able to "mask" the physical expression of the blue-eyed gene. Alternatively, the child could have only the genes that code for brown eyes."

Here is another site that covers eye genetics:
http://sln.fi.edu/tfi/units/life/forums/anatomy/eyes.html

Here is another site specifically for canines:
http://www.canismajor.com/dog/gencode.html

Hope this helps.

Dawn