Rits
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I don't think its genetic. I think coat shine is largely nutritional and indicative of health but also other outside factors can have a play. Like playing in the pool and not rinsing or bathing afterwards could strip and dry the coat of the shine. Lighting plays a huge factor too. A dog can look dull in dim lighting and be shiny with full sunshine. I often find dogs with a dull coat, when I pet them my hand is left with residue. Smell your hand and it smells doggy - dirt, grime, and oils. I feel a healthy coat shouldn't smell strongly of any foul odors or leave any residue behind on your hand. And that healthy coat that doesn't do that is often the shiny coatI think @Oh Little Oji mentioned one time the really shiny blacks seemed to be genetic, as some blacks just didn't get that shine. After doing the Embark genetics testing I found out that my dog is BB, no dilutes in her system at all, so the lightbulb came on wondering if that's what gives her that black-black shine. Also wondering if a black puppy from a Black/Red breeding that expresses black, but carries the red gene isn't that shiny black Oji refers to. And on the subject of reds, would a red puppy coming from the Black/Red breeding perhaps be a deeper red rather than a paler red? I love genetics. I'd have to go do more homework though because I'm not sure if a red can express red if carrying any black gene. Hmmmm.
