Q. After 5+ years, our cat has started attacking other pets in the home with no visible provocation. We have recently started packing to move.
A. Cats can act differently when things in their environment changes. You can try feliway diffusers but if you are moving then there is going to be regular disruption so it maybe better waiting until you are settled in your new place. It could also be a neurological problem such as a brain lesion or due to pain so I would recommend having her checked over by your vet just to rule out any medical problems.