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Cats/1 1/2 yr old sister kittens-1 is hissing at the other

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We have 1 old kitty-15 yrs-and 2 sister kittens who are 1 1/2 years old. We went through the whole hissing at each other thing after they came back from the vet from being spayed. But today I took the old big kitty to the vet. When we came back, my daughter let one of the sisters out, (the other sister is more mild mannered & has no interest in going outside). I had to get her back in fairly quickly as we had to leave & when I caught her & brought her back in, she hissed at her sister whom she normally plays & sleeps with. When I came back home tonight, she was still at it, hissing when her sister got near her-it's so strange & am not sure what to do. I'm concerned about the littler of the two, although she does seem to be holding her own. Did the more confident sister just decide that dhe's the cat meow because she's been prowling around outside & has gotten all cocky?  I just can't stand to see my little sweet petite being bullied!

Answer
Hi
this is a behavior known as aggression trauma and is caused when something happens which makes another cat afraid. often aggression etc are signs of fear.

This is a common problem especially after a trip to the vets. basically the hissing cat is afraid by the smell of even the other scat own fear after the vets. often this will subside by itself but in some case they need a helping hand in rebuilding their confidence in each other again. this is done by using the introduction method described here.

/introducing-cats.html

best wishes Kate

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Kate Tilmouth

Expertise

I can answer most day to day cat problems encountered by owners. I have a good understanding of cat behaviour and problems which may arise from changes to their daily routine. I can advise on cat training including litter training and general day to day cat care issues. I am not a vet and therefore cannot answer medical questions.

Experience

I run my own cat website at http://www.our-happy-cat.com and have been a dedicated cat owner for over 20 years. I have encountered many different cat problems and situations and feel that i have a good understanding of cats and cat ownership.

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I am a platinum member of Ezinearticles where i write mainly cat related articles.

Education/Credentials
Educated to High School level and have since worked for many years in a customer support based environment, gaining vocational qualifications.

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