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I think you're right Wolfgang, she's a Basset Fauve and so she probably carries the gene - comes from the Petit Basset Griffon Vandeen, one of the breeds used in the recreation of the Basset Fauve. However, I have also seen online just now that premature greying could be caused by stress on her liver or kidneys by inappropriate food - she does like her raw vegetable titbits when I'm cooking and she does eat a lot of grass. Apparently, it could also be a sign of thyroid problems. She's a lazy beast but I've always put that down to just being a hound but maybe I'll take her to the vet for a blood test, just to make sure. Thanks for your input everyone, I appreciate it.