Our expert says:
Generally it is quite unusual to get such a dramatic behavioural change post op. Some cats can get aggressive post op esp when other house hold cats want to interact as the operated cat is painful/stressed.
Have you introduced any other cats into the environment following the sterilisation as this maybe the cause of the problem and not the surgical procedure.
You can try Feliway and/or Depo-Provera (Medroxyprogesterone acetate) which is a synthetic form of the hormone progesterone (sex hormone). Feliway available from your local veterinary practice/vet shop. Depo-Provera can only be administered by your veterinary surgeon.
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