There are two different types of hairless guinea pigs: skinny pigs and Baldwin guinea pigs. Skinny pigs have a very small amount of fuzz on their feet and noses, and Baldwin guinea pigs are entirely hairless.
Sometimes referred to as "skinnies," skinny pigs are known to be mischievous and curious, just like their haired relatives. According to The Urban Pocket Pig, many skinny pig owners claim that the animals are more playful and fun-loving than regular guinea pigs. Because they lack a proper coat of fur, hairless guinea pigs are sensitive to extreme temperatures and need to be protected from harsh wind and direct sunlight.