This section is from the book "Cats And All About Them", by Frances Simpson. Also available from Amazon: Cats And All About Them.
If you intend having a cat made neuter you should keep him on low plain diet for two or three days before the operation. Do not hand your pet over to an inexperienced person, but take it to a good veterinary and pay the extra fee for cocaine or chloroform to be used.
Opinions differ as to the most suitable age for a cat to be made neuter. I think that from five to eight months is the best time, as kittens gelded when very young do not attain the same fine proportions. After eight months there is more risk to the animal, and the operation ought not to be performed at all if the male has shown any desire to mate. At all times send your puss to a well-qualified veterinary.
I have been told on good authority that if a female cat is to be made neuter she ought to be allowed to have one litter before the operation is performed.
 
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