Shorthaired guinea pigs are easier to look after than longhaired ones, as you only have to brush them every few weeks instead of everyday. They are recommended to first time owners and children.
The American cavy is the most common type of all Guinea Pigs and domesticated almost worldwide. Its fur is short and tight. The colors varying.
These cavies have also a short and tight fur. The difference to the default American cavy is the swirl on its forehead. Crested cavies come in two variants: If the crest is in main fur color it is called a English Crested. If its swirl has white color it is called American Crested.
The short hair Peruvian might not look as it is specified as a short-haired. But if you take a look to the long-haired breed you will understand this fact because the short haired fur won't grow that much. The Peruvian has two swirls on its back, comes in various colors and its fur is mid-length.
This kind has exact eight cowlicks on its back. Four of them are directly on its back. Two of them are at its haunch and the other two cowlicks are at the front of its body. The fur is mid-length and the color varied.
The wooly-pig! Rex is a short-haired cavy with very curly distant hair without guard-hair. The length is at max 35mm but due to its curliness it is close-fitting on its body.
You might confound US-Teddys with Rex but the fur is more tight and shorter. The peritoneum is smoother than the hair on its back. At least there are two different hair types: Wirily and fluffy.
The CH-Teddy has longer hair than other Teddys or Rex cavies. The fur is tight - at least 60mm long and distant. Swirls are not allowed. A crest is undesired but almost accepted.
The Ridgeback has a continuous hair comb on its back starting from its ears along the whole spine. The fur length is ~25mm and has no swirls.
Because of its cowlicks they belongs to the Abyssinian. The difference is that Somali has curly short and close fitting hair like Rex or Teddy cavies.
The Curly is a quite new breed. The fur of a curly is distant and abrasively and has two swirls on the pigs haunch. A Curly with cowlicks is called a Curly Abyssinian - this is shown on the picture. The heredity transmission of its curliness fur is dominant.