Some japanese akitas, though rarely, have black or purple spots on tongue. Is it generated by ancient crossbreeding with chow chow, or is it another kind of problem?
No, it doesn't come from cross breeding with Chow Chows. Its not "another kind of problem" either... its just an undesired marking, not a 'problem.' Anyway, it is an inherant part of the Nihon Ken gene pool, though you see it more on brindle dogs. Thus many Kai have tongue spots.
So the black spots or marking on Akitas tongues are an undesirable trait? Both of my AA's have had those. I love the liver spots that used to be common on the AA'S, especially the legs. They both also have black spots on their feet.
Thanks @PoetikDragon! Now it is clear for me! In Italy the purple/black spots on akita's tongue are defects of disqualification in expo and I was curious to know it. Thanks!
My Kai Ken's tongue is almost completely black. The NIPPO judge told me it was not a strike against him, but to not double up on that and "find him a girlfriend with a pink tongue"...
In NIPPO tongue spotting has long been seen as being a result of past cross breeding, which is why it is not preferred in the Nihon Ken. Since most Kai have it, it is allowed to a certain degree (vaguely not more than half the tongue). In NIPPO, a marking up to the size of the tip of a pinkie (or thereabouts) is allowed without point deduction. Anything larger is a fault. Many Hokkaido have tongue spots as well.
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There's a post about it on AKC's site:
http://www.akc.org/press-center/akc-syndicate/ask-akc/black-spots-on-dog-tongue/