Welcome to The Cat Site
your cat community
Interact with our community
Share A Funny Cat Story To Win Gwen Cooper's Book! Click here for details

Cats Not Getting Along All Of A Sudden

Discussion in 'Cat Behavior' started by Koetiker, Dec 6, 2018.

  1. Koetiker

    Koetiker Thread Starter TCS Member Kitten

    Dec 6, 2018
    So, last year around this time our younger cat, Otis, started being really aggressive to our older cat, Milo. This lasted about a week. We separated them, sedated Otis with clamicalm. And worked with them every night giving treats and slowly bringing them back together. Eventually Otis came around and all was good. A few months later and it happened again. Again we repeated the process. This time it only took a couple days.

    Last Saturday Otis went after milo again. This marks 3 times in one year he snaps and just hates him. Milo is more timid and kinda just a fat and happy cat. We are trying the same methods again but Otis now won’t take the clamicalm and after 5 days still is hissing at Milo. Only difference now is he isn’t chasing him.

    We don’t know what to do anymore! Is it possible that these two cats just aren’t meant to be? Can anyone give me some advice?

  2. abyeb

    abyeb Charlie's Purrson Staff Member Forum Helper

    Feb 18, 2017
    Can you think of anything that changed in their environment recently? Have either cats been to the vet? Sometimes, if one cat goes to the vet, but the other one doesn’t, they’ll smell different afterwards, which can trigger non-recognition aggression: How To Deal With Non-recognition Aggression In Cats

    Another possibility is that this is redirected aggression. Are there any outdoor cats in your area? If cats feel like there’s another cat “invading” their territory, they might get anxious and lash out at the other resident cat. This article explains redirected aggression further: Re-directed Aggression In Cats

  3. blumarine916

    blumarine916 TCS Member Young Cat

    Nov 29, 2018
    Gosh I have this problem too early this morning. They were ok the night before then at 4am one of them attacked the other when she was using the litter box. Lots of hissing and angry meows. I had to separate them by locking one with me in the bedroom until morning. Just like Koetiker’s cat, my 2nd cat is fat, sweet and happy.

    I hope someone can explain this.

  4. FeebysOwner

    FeebysOwner TCS Member Top Cat

    Jun 13, 2018
    FL/Orig: OH
    @Koetiker Hi. I truly believe that there is an event, or a trigger, causing Otis to become aggressive toward Milo - because it is not behavior happening all the time.

    Were there any brief medications (seasonal allergy treatment, as an example) being given to Milo that would correlate to the time of the incidents? Sometimes, meds can cause a cat's scent to change, and Otis picks up on this. Maybe Otis is the one with a seasonal allergy issue, causing him to act up?

    Do they generally get along well, and hang out together - or, just tolerate one another?

    Same kind of thing possibly for @blumarine916?

  5. blumarine916

    blumarine916 TCS Member Young Cat

    Nov 29, 2018
    My cat Meffy is currently in a cone for the 3rd week now due to abcsess on her bum. That could possibly trigger her sudden aggression. I’m just so shocked that she suddenly attacked the other cat when they were doing okay for the past 2 weeks (after Meffy’s vet visit).

    Thankfully they weren’t fighting when I returned home from work. The laundry basket is overturned though. Sigsn of a kitty scuffle perhaps?

Share This Page

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies.