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Cats/Female kittens together while in heat


Hello, I have two kittens both female, one is spayed and the other is not. The younger kitten just went into heat for the first time. The old spayed kitten appears to be aggressive with her all of a sudden. Is this normal? Is it safe to have them together? Does the spayed kitten feel challenged in some way? should I separate them? Thank you for your help.

no i would say that the aggression is just a normal cat territory issue. Your spayed kitten is just trying to let the other kitten know that she still has certain territory rights, cats will do this every so often. The only time this may get worse is if the other cat does become pregnant and then their is likely to be fights for territory as cats don't want too much competition form other cats and kittens.
I wouldn't worry too much but just keep an eye on them just in case a spat turns nasty.



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Kate Tilmouth


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.


I run my own cat website at 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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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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