Rex guinea pigs have a special hair structure that gives the appearance of plushness. The coat should be thick, short and elastic without rosettes (the length of the coat does not exceed 1.5 cm). The coat on the back and head should be quite coarse given that the coat on the sides and belly is softer. The head of a Rex guinea pig should be broad and moderately blunt, with a sufficiently large distance between the eyes. The eyes should be large and clear. The ears should be large and drooping. The body is of medium length with broad shoulders.
- Long wool.
- Flat-lying wool anywhere.
- Too soft coat, lacking density and texture.
- Wool lying in different directions, ridges.
- Outlets or partial outlets.
Rex guinea pigs are bred in a wide range of colors, although there is a conditional division into four groups depending on color:
- Agouti (the pig should be completely agouti, agouti pigs with lightening around the eyes, on the chest and abdomen can also be exhibited in this color category).
- Agouti bicolor (Agouti in combination with any other color)
- Rex (AOL) – any other color that does not fit into the above description.