Some dogs have front or back or both. Some breeds have double dew claws (two on each paw). Our vet recommends only if they are a working dog or are at risk of having them ripped off. Autumn has hers yet but got close to having them removed after they got caught and I freaked, they were ok thankfully. I don't see getting these removed as bad as cropping or docking as they do get ripped off more often than not.