Limping or favoring a foot can be caused by a broken or ingrown toenail, a cut, a foreign object between the toes, or a burn.
The first thing you need to do is identify the source of the problem by examining your cat's paws closely. Be gentle and use caution when touching a sore paw. Even the most mild-mannered cat is likely to nip if it is not used to having its feet handled and you touch the source of its pain. (We always advise pet owners to handle their cat's feet often beginning at an early age in order to build trust for situations just like this.)
Once you have identified the problem, here is what we suggest:
If a toenail is broken, it can be very painful. The fractured nail should be removed entirely. Anesthesia may be required. Hemorrhage should be controlled either with styptic powder, bandage, or cautery. Once the nail is removed, healing will begin. Eventually, a new nail will regrow. This may take months, and the nail may be malformed. Depending upon the injury, antibiotics may be given. Some cats, especially those with polydactyly may have a nail curve and grow into the paw. Nails with this tendency need to be clipped regularly.
If your cat has a small cut, wash the foot with a wound cleanser, apply an antiseptic ointment, and wrap it with gauze. Trying to keep a bandage on a cat's paw can be very difficult so you may want to contact your veterinarian. If the cut is large, deep, or bleeding a lot, also consult your veterinarian.
If a foreign object is lodged between the toes or in the pad, carefully remove it with a tweezers. Burrs are common culprits. Hair mats can also form and cause discomfort. Clip back mats. Wash and apply an antibiotic cream if necessary.
Handle mild burns as you would a cut. Wash, apply an antibiotic, and cover with gauze. If the burn is severe, consult your veterinarian.
Examine your cat's feet weekly as part of your health maintenance check. Clip your pet's nails to avoid broken nails and cut back any broken nails. In long-haired cats, you may need to trim excess hair between the toes.
Include a close look at your cat's feet as part of your weekly pet health check. If a minor problem does not heal, or there is serious pain, redness, fever, loss of appetite, or you are unsure of what to do, contact your veterinarian.