Primary seborrhea is most commonly seen in the American cocker spaniel, West Highland white terrier, English springer spaniel, and Basset hound. It is also seen in the Irish setter, German shepherd, dachshund, Doberman pinscher, Chinese Shar-pei, and Labrador retriever.
...Early evidence of the disorder such as mild flaking and dullness of the coat may appear as young as 10 weeks of age. Because these signs are subtle, they often go unnoticed. However, usually by a year to 18 months, the signs have become pronounced. Affected dogs commonly have a dull coat with excessive scaling, a greasy feel and smell to the skin (especially in areas of body folds), smelly waxy ears which may be infected, thickening of the foot pads, and dry brittle claws. Some breeds (West Highland white terrier, cocker spaniel, springer spaniel, Basset hound, Shar-pei) are more prone to the greasy form of seborrhea (seborrhea oleosa) with chronic ear infections and greasy skin,