Ok yes, wolves don't use there claws/nails for wounding, they use them for gripping the ground when hunting. But if an average house dog were to 'scratch' you, it can really hurt, it depends on how often their claws/nails are trimmed or what sort of terrain they usualy walk on. For instance, if a dog lived in a city and was usually on concrete, their claws/nails would be blunter because they would have wore down when walking on concrete, but if a dog lived in the country, there would be less chance of their claws being worn down, so they would be sharper, and since wolves don't tend to live in citys, their claws/nails would be sharp. But no, wolves don't use there claws for wounding, simply gripping the ground.