Neutering is a general term for castrating a male or spaying a female cat.
You can find information on castrating a male cat here.
Spaying or ‘neutering’ is the surgical removal of both the ovaries and uterus of a female cat. Performed as a routine surgical operation under general anaesthetic, the cat is admitted in the morning and usually collected later the same day. Generally the procedure is performed through a small incision on your cat’s left flank, however it may be performed on the cat’s belly in certain circumstances. Some owners elect to have the procedure performed on the belly in pedigree or show cats as there is a chance that the hair that is shaved for the procedure may regrow a slightly different colour. Although there is no harm in this, it may look a little strange and would not be ideal in the show ring. There is a small surcharge for a ‘midline’ spay as it takes longer to perform and requires a few more materials.
We recommend female cats are spayed at 5-6 months of age. If your cat has recently had kittens it can be spayed as soon as the kittens are weaned.
The primary reason for spaying is to prevent unwanted kittens from being produced. Other benefits include:

The desire to roam in order to find a mate increases the risk of fighting or road traffic accidents.
Unless you want to use a female for breeding purposes there are few advantages and many disadvantages to keeping an unneutered female cat.
Neutered cats have fewer medical problems, live longer on average, don’t add to the pet overpopulation problem and make more loving and rewarding pets.
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Your local Vets4Pets Veterinary Practice can give you further advice on neutering your cat. Please select your nearest practice from the list below.