What characteristic of the Otterhound's undercoat requires specific grooming attention?

Answer

It is short, wooly, and slightly oily.

The coat structure consists of a dense, rough topcoat overlaying a short, wooly, slightly oily undercoat, which contributes to the waterproof nature but requires weekly brushing to prevent matting.

What characteristic of the Otterhound's undercoat requires specific grooming attention?
DogpetbreedcompanionOtterhound