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Choose a person your cat knows and trusts. Have your helper hold the cat in place. Hold one of your cat's paws in your hand. Trim your cat's nails as you normally would. Check your cat's nails on a regular basis.
Don't get a stranger or relative stranger to help you trim your cat's nails or your cat will be even more scared. Though it sounds good and fine to get your cat used to having its nails trimmed, the reality is, many cats will still protest every single time, and you may have to get some extra help to do it. You can both try standing on opposite sides of a raised surface, like a counter.  Both of you should talk calmly and reassuringly to the cat. Have your helper pet the cat and try to keep it in place by holding on to its body without hurting it or scaring it too much. If your cat enjoys being brushed, the other person can brush the cat to distract it from the fact that it's getting its nails trimmed. Have your helper brush the cat’s head, under its neck, or in other places where it enjoys being brushed. While holding the paw, push down on the pad to extend the claws. If your cat is being rowdy, wait for it to settle down so that you can isolate the paw. Your helper will continue to distract the cat while you trim its claws.  Just follow the directions in the previous section to make sure you give your cat a smooth, painless nail trim. When you're done, reward your cat with a nice treat. Every cat's nails will grow at a different rate, but it's good practice to trim your cat's nails somewhere between every two weeks and every month so that its nails don't get too long, split, or break.  Though your cat will likely sharpen its claws and keep them in good shape on its own, keep an eye on its nails nonetheless. Your cat could be walking around with a broken nail, and you can help it out by trimming it into shape. Older cats need special attention because their nails are thicker and can sometimes press around into the pads and cut into them. Check your older cat's nails every week, and clip the tip off if necessary. This is much easier than letting the nails get overgrown, which can cause them to impact into the pads. If this happens then the cat will need to see a veterinarian because antibiotics may be necessary.