Has she got any warts? It's normally older dogs who get warts, but maybe puppies can get them too? My old girl (who's nearly 13) has a lot of warts & occasionally they itch like mad & she's like Thumper the Disney rabbit scratching & banging her back leg on the floor. The vet refuses to remove them because of her age (it's too dangerous to anaesthatise an elderly dog apparently), but if a youngster had warts, they could probably be removed.