The PediPaws nail trimmer is meant for cats and dogs, but I decided to try it since I worry about the pigs having jagged nails after a trimming and scratching each other during a mad dash to the food bowl. There were multiple problems. First, the PediPaws was awkward to hold while also holding a squirming pig. Second, the noise freaked the pigs out even more. Third, I only tested it out on one nail and it took forever. Maybe the PediPaws trimmer would work better for bigger, braver animals, but I will not be using it on my guinea pigs again. I'm curious how well it works for dogs or cats. Does anyone have any experience with this?
If you cut the quick, don't panic. I have found that a pinch of flour will stop the bleeding pretty fast. Otherwise, you can use styptic powder.
Get it here: http://www.amazon.com/Miracle-Care-Kwik-Styptic-Powder/dp/B0002H3RBU/ref=cm_cr_pr_product_top
Dark nails can be hard to cut because you cannot see the quick as easily. Some people have suggested shining a flashlight through the nail to locate the quick first.
Once you're done, it's a good idea to quickly run a nail file over any jagged edges.