Optigen.com explains ICT with the following:

 "Ichthyosis, whose name is derived from the Greek word for "fish" due to the fish-like scales that are observed on dogs with the disease, is a common inherited dermatosis observed in the Golden Retrievers of Europe and the United States.  Dogs with Ichthyosis develop white scales on the skin soon after birth.  The scales persist through the animal's life and progressively blacken, becoming dry and rough with age but typically do not cause itching."