Scratching and biting part 2 / puppy training tecniches

I personally always thought dogs scratched and bit themselves as a way of
> cleaning themselves. I scratch myself so I never thought this was a problem
> My wife spends more time with the dogs and she said for several months
> Ranger has bee scratching more than usual. Looking at Ranger this morning
> we see that she is wet from licking and biting.
>
> We are feeding raw and have been for about a year. Mainly Nature’s Variety
> raw and cuts of raw red meat. She only likes certain flavors or Natures
> Variety and we keep her away from chicken because it seems to give her bad
> stool.
>
> Both dogs have been on the same flea/tick preventative since pups (they are
> going on 2 years of age) which is Vectra 3D. We very rarely bath them
> because we do not want to diminish the effectiveness of the Vectra 3D.
>
> We are extremely careful about cleaning products and usually use water. We
> use no air fresheners.