2 adjectives to describe nit

Several terriers with good coats are apt to grow long hair very thickly round the neck and ears, and unless this is removed when it gets old, the neck and ears are liable to become infested with objectionable little slate-coloured nits, which will never be found as long as the coat is kept down when necessary.

Several terriers with good coats are apt to grow long hair very thickly round the neck and ears, and unless this is removed when it gets old, the neck and ears are liable to become infested with objectionable little slate-coloured nits, which will never be found as long as the coat is kept down when necessary.

2 adjectives to describe  nit