Well there are a few differences in between trimmimg dog and cat nails. The main difference is that cats retract their claws-hence why you have to press on the pad to get the nail. Dog do not do that. With a newf you will have to kind of dig through the hair to locate the nail
I use the clippers that look simular to a pair of pliers. The heavy duty ones with the orange handles. As far as frequency? It depends on what type of surface your dog walk on. Grass, carpet and "soft" floors do not wear the toe nail down so you will have to trim it more often than dogs that are on concrete or go for walks on concrete or other hard surfaces. As a general rule I trim toe nail about once a month.
Remember as the nail grows so does the vein in the nail. If the nails are very long then you can only trim off a little so you will not get the vein or quick as it is called. After you cut the nail the vein will recede and in a couple of weeks you can trim the nail even shorter until you can get the nail to the proper length. If you do get the quick and the nail starts to bleed. Don't worry your dog will not bleed to death. You can purchase quick stop to apply to the nail or you can use flour. Remember to press on the end of the nail because blood needs something to clot against.
One time I had a customer who's dog I got the nail too short. I told him if it starts to bleed again to use the flour. A few hours later he called because is dog was vomiting because of eating the flour. Seems he just stuck the dog's paw in a bowl of flour thinking it would stop the bleeding and the dog munched on the flour and got sick. Some people just don't think.
Oh I deleted your duplicate post
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[This message has been edited by jggrosch (edited 04-04-2002).]