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hi:
have 2 brothers that we adopted together @ 8 weeks old about 2 1/2 yrs ago. One recently got sick and was in hospital/vet for 3 days. Upon bringing him home yesterday, his brother has been constantly hissing and not accepting his brother back at all! I've rubbed him down w/ old blankets they both slept on, separated the two last night (they were home alone togehter today). But he is still visisibly upset and contiunes to hiss.  The sick kitty seems to have no clue why he is acting this way and continues to try to be around him. Very sad! Do I need to try regualar introduction techniques? I would have thought since they are brothers and grew up together it wouldn't be an issue! help!

Answer
Hi
this is a common problem and it is called trauma aggression. It is caused when something has upset one cat and blames the other cat for it, even if the other cat is not at fault. In this case the cat left behind might be upset by the absence of his brother and because he feels upset and unsure he is expressing this as aggression. I know it doesn't make a lot of sense but i come across this time and time again. Yes you completely correct you try and reintroduce them together slowly, this will give the cats time to adjust back into their secure environment and routine.
I'm sure they will calm down again and things will return to normal again soon.

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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