One of our pomanerians had the itching problem after bath, it had to do with the shampoo we were using. Since then we switched to some sensitive skin type shampoo from the vet, she's been fine since.
I've been wondering about the dry shampoo, how good is it? When the 2 of them get into a little wrestling exercise, one would pull the other one over the floor, like sweeping the floor for us! We try to keep the floor clean all the time, but with the amount of fur they have, they don't seem to be as always fluffy!