Begin clipping your Rottweiler's nails from an early age, if possible, to condition your dog to this essential grooming process. Massage the pads, and inspect the areas between the toes. Take this time to bond with your dog. Over time, this will counteract the dog's natural instinct to pull away, which can cause injury to both you and your Rottie.
Place a well-ventilated muzzle around your Rottweiler's nose if the dog has a tendency to bite or is combative. Use a soft muzzle that is a comfortable fit for the dog. A soft muzzle allows your dog to breath, bark and even drink water while in place.
Squeeze the handle together to open the clippers if you are using clippers. Carefully insert a small portion of the tip of the nail into the clippers and squeeze the handles again to clip off the tip of the nail where the nail begins to curve. Since Rottweiler nails are black, it's difficult to know where the quick is. If you clip too short, the dog will experience pain, bleeding and will generally never forget it, making the next time nearly impossible. Always clip only a little at a time and never go beyond where the nail begins to curve. A better alternative for this task may be a rotary sander. A rotary sander is not good for dog's with an aversion to noise. However, it cuts down on the chance you will clip the quick since you sand off a little at a time.
Cut just a few of the dog's nails at one sitting if the dog is bothered by the clippers and/or the noise of the rotary sander. You can always come back the next day and try again.
Keep cornstarch or a styptic pencil handy in case you get too close to the quick. If you do see bleeding, touch the styptic pencil to the cut to stop the bleeding. If using corn starch, dip the nail into the cornstarch.
Reinforce good behavior by rewarding the Rottweiler with a treat after each nail has been cut.