The Baldwin guinea pig is a breed developed from a spontaneous genetic mutation in Carol Miller's show-line of white crested golden agouti.

[1] Baldwins are known for having skin of a rubbery texture, many wrinkles and large, droopy ears.

[9] Since the chance of getting a Baldwin is low, and because it is not possible to visually tell the difference between a haired guinea pig that does carry the gene and one that does not, this method of breeding is not recommended.

Breeding a Skinny pig with a Baldwin will result entirely in offspring that are haired yet carry one copy of the gene for Skinny pig hairlessness and one copy of the gene for Baldwin hairlessness.

[9] Even though the Baldwin is a relatively new breed among pet owners and cavy fanciers, it is gaining popularity for its unique appearance.