The marked group is a large group of breeds. The markings on the guinea pigs in this group are placed specifically which is what distinguishes one from the other they comprise of patches, spots, roaning, brindling and points.

Tortoiseshell and White (TSW): TSW'S are Black/Red/White in colour. The colours are evenly distributed in " patches " down the sides of the guinea pigs body with an opposite colour on either side.
Brindle: The brindle is black and gold and the two colours intermingle evenly with each other to create a brindled effect.
Dalmatian: Dalmatians come in many colours although are mostly found in chocolate or black. The head is a solid colour  as are all four feet and the " spots ". The guinea pig has a white blaze down the face and has a white body.
Himalayan: Himalayans can be found in either black or chocolate. The ears/nose ( smut ) and feet are all one colour and the body is white. Some Himalayans are darker and richer in colour than others. Himalayans are born completely white and then develop their " points " after a few weeks.
Magpie: Magpies are marked similar to the tortoiseshell and white although consist of only black/white and black/white brindling patches.
Roan: Roans consist of two colours, white and another colour. The head of the roan is a solid colour and all four feet are the same solid colour. The rest of the body is the same solid colour although is mixed with white hairs. Roaning itself can be found on many guinea pigs although the Roan breed itself is described as above.
Dutch: Dutch guinea pigs are a mix of two colours one of the two colours being white. They have a white blaze running down the face/shoulders are  white and the middle of the body is also white. Their should be a line around the lower waist where the second colour begins and continues to the back/rump of the guinea pig. Each cheek of the guinea pig should match this second colour. The Dutch guinea pigs feet should all remain white.
Bi-Colour: The Bi-Colour should have the same patching as a TSW although the Bi-Colour consists of only two colours.
Tri-Colour: The Tri-Colour should have the same patching as a TSW although the three colours on the guinea pig can be any other colour combination other than black/red/white.
Sable: The sable is a very hard to find breed and is quite rare. The guinea pig is a solid blackish/chocolate colour with the ears/nose ( smut ) and feed of the guinea pig all a darker shade of the same colour.
Harlequin: The Harlequin is similar to the magpie although the colours on the guinea pig are either chocolate or black with cream patches and black/cream brindled patches.

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