That is so odd! I would really recommend using high end products made for dogs. I used to use Pantene on Barney and then the vet was like yeah you are nuts.
I use these spa products for Barney- they have a whole line and I really trust them to make him pretty!
www.happytails.com
Try the comfy dog oatmeal shampoo and also Fur Butter- a deep conditioner
Good luck!