We had a problem with this last summer. When my daughter would wear shorts sometimes Gracie would put her feet up on my daughter legs and she said it hurt.
The crystal or glass nail files work pretty good to take the points off. You can also get a dremel for pets. I think they are a much kinder and much less painful way of doing a dog's nails and you can round the edges so they don't scratch anyone.
Amazon.com: Dremel 7300-PT 4.8-Volt Pet Grooming...