I like using this dog appliance because you don't need to wet the dog skin and add shampoo you can just wet the skin and throw the shampoo in the container then begin brushing and washing the dogs skin. Click the link below to shop.
Best dog brush to wash there skin
Pet Shampoo Brush, Silicone Massage Rubber Bath Comb With Shampoo Dispenser, For Dogs And Cats Grooming Tool, Random Color Delivery