Why does my cat hiss at her sister after she returned home?

Question

My 2 cats Stella & Callie are sisters. We adopted them together in April ‘19. They’ve always been inseparable- they used the litter box at the same time, ate at the same time & slept intertwined with each other). Callie went missing for 2 months. Stella meowed constantly & wandered around the house searching for her sister. Thankfully, we found Callie last week! We thought Stella would be thrilled. But now Stella won’t go anywhere near Callie & hisses at her when she gets too close. Why? Pet's info: Cat | Domestic Shorthair | Female | unspayed | 9 months and 12 days old | 4 lbs

Ana M, DVM · Accepted Answer

Thank you for submitting your question regarding your cats. I suspect that Stella is stressed by the return of her housemate. Callie likely smells and acts a bit different after being gone for so long. I would keep them separate to allow them time to readjust to each other. They should get along fine, but it will take some time. I hope this information helps!

Why does my cat hiss at her sister after she returned home?

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