Woke up this morning at 5am to my cats having a full on fight, hissing, growling etc. They do occasionally have "play fights" and will stop as soon as I intervene i.e. shout stop, clap my hands loudly. This morning one cat just wouldn't back down and if I approached her she turned the aggression on to me. I ended up shutting her in the bathroom til feeding time at 7am. Both cats were eating fine and angry cat had calmed down and had let me stroke her etc. All of a sudden she spun round from her food and started growling and hissing at other cat and that was them off again! I've come back from school and neither are to be seen, hiding under beds or somewhere.
They are both spayed females, littermates, nearly 2 years old. This behaviour is out the blue and totally out of character. It seems like one cat is the aggressor and other cat is just reacting to that.
I know I need to rule out illness or injury with a trip to the vet, but frankly I'm bloody terrified to try and catch her to put her in the carrier! Yes I know I'm a big wimp.
There have been no recent changes in the household or diet etc. DD did buy a little catnip toy last week so I'm wondering if it could be that but she's been fine with it until this morning. Would it have a delayed effect re aggression?
Sorry this is so long!