I hate it when I do that to my dogs, too! Makes you feel so bad...

I'm not familiar with a "nic fix stic," but one thing that works great to stop bleeding is styptic powder or a styptic pencil. You can get this in the grooming section at any pet store. Dab it on and the nail will stop bleeding. That, combined with the safety-guard clippers, is probably all you can do!

If your dog has dark nails, that makes it particularly hard to trim them to the right length. If my dogs had black nails I'd be too paranoid to cut them myself and just have the vet's office do it!

What kind of dog do you have? Feel free to share pictures (hint hint)!