I have been noticing something when I brush Star. She seems to have dandruff. As I brush her little white flakes start working their way out of her coat. I don't bathe her often (in the eight months I've had her she has had three baths with moisturizing doggy shampoo) and I brush her a few times a week. Her coat is super shiney and healthy looking, so I am not sure what could be causing the problem. She is eating food that I buy at a grocery store, so I was wondering if diet could be contributing to the problem. Is this something I should take her to the vet for, could it be a sign of something serious?