If you breed within a small genetic pool you will run into trouble, regardless of colour. My Hephzibah is black and lack of bone is certainly NOT her problem, nor that of her sire who is from black to black mating. Of-course, i would never dream of putting together 2 dogs just because they were coloured. Actually, I do not plan to breed 2 coloureds together at all. I will only breed another 1 or maybe 2 litters; one definitely from Claudia to the best dog i can find (in this moment i am tossing between one that just happens to be fawn parti, and another one that is brindle with white trim). The colour of the sires is totally irrelevant to me, but I will be keeping the best coloured pup from that litter. Of-course if the only coloured pup in my litter has some bad fault i would not keep it just because it was coloured, that would be self defeating. I do not understand what you mean saying that you "did not breed for colour". When you mated your blue bitch you were most likely to get colour, if you mated her to fully pigmented fawn or brindle, you could have also got blacks. But if you decide to keep the fawn out of your litter, she will never give you coloured pup unless, of-course, you made her to a coloured dog. Therefore, if we want to improve the coloured dogs we need to keep the coloured pups to breed on with. The only way we improve the coloured dogs' quality and reputation is by breeding from them.