The translation "Peinture marron" for "paint brown" is literal and not offensive but may be less natural than "Couleur marron".

The translation "Peinture noire" for "paint black" is literal and not offensive but could potentially be replaced with "Couleur noire" for better naturalness.

The translation "Peinture beige" for "paint beige" is somewhat literal but not offensive; depending on context "Couleur crème" might be more natural for a pet's color.

The translation "Chaussettes marron" for "socks brown" is accurate and appropriate.