A normal and healthy guinea pig has 14 toes in total with 4 on each front foot and 3 on each back foot. Some guinea pigs are born with an anomaly - an extra toe. Such genetic mutation is called polydactylism, which means "to have many fingers", which usually means to have more fingers than usual. Such mutation can occur for various reasons and if they begin to cause discomfort to the guinea pig, it can be removed safely by a veterinarian.