Yes, the Scepurian claws follow the same familiarity rules as any other weapon. Dogs, Horses and even people with long nails do not instinctively know how to use these as a true weapon. You will get scratched or stomped when there is no intention and when the intention exists, then the method of attack will not always be the correct one. Thus Scepurians have spent their lives up until becoming adventurers trying NOT to accidentally scratch or cut other people, but now they need to learn when and how.