Q. My usually loving cat has 2-3 week long episodes where she behaves HORRIBLY, hissing, growling, etc. Can cats be bi-polar? Can't even get near her.
DAVID ELBEZE, DVM, MRCVS
A. I have encountered several cases which sound similar to your problem, unfortunately the reason usually remains a mystery and isn't always treatable. I would try to use over the counter calming agents like felliway first, then consult an experienced cat behavioural specialist if this doesn't help. Last resort would be long term meds to try and control this behaviour.