out your dogs skin. don't use shampoo for people no matter how mild. your vet can tell you pretty quickly with a simple skin scraping what may be causing it.
think first - before you apply a laundry product on your pet ask yourself if you would apply it to yourself. if the answer is no then don't do it. it may also prove to be something that your pet will have a negative reaction to leaving you with only one more problem to deal with. 