The cat’s pedigree is Persian. If we look at the Persian Breed Standard we read:
> COAT: long and thick, standing off from the body. Of fine texture, glossy and full of life. Long all over the body, including the shoulders. The ruff immense and continuing in a deep frill between the front legs. Ear and toe tufts long. Brush very full.
From this we can appreciate that the ruff is the collar of long hair around the animal’s neck that stands out somewhat as an Elizabethan ruff.