Our expert says:
Hi Sheena, cats can unfortunately be very territorial especially towards a new resident! This territorial behaviour might sometimes be partially hormone driven, so I would definitely recommend that you have her sterilized if this has not already been done. There are also various homeopathic products on the market spesifically for behavioural problems in cats that you can try out. Just seek advise from your veterinarian before using them. You can also consider to contact a behavioural specialist regarding the problem. Unfortunately though some cats just have a very strong territorial instinct and will not tolerate any strangers!
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