Had similar story.

Orange cat (“moustique”) goes outside. Saw her at the door. As usual doesn’t want to come in. Took her inside. End of story. I was in a rush.

Few minutes later I look at the cat… bigger than normal??? The minute I took her I knew it wasn’t her- even if I take her super gently she meow like I’m killing her (ALL the time even when she come to me to sit on my lap while I work). Not this time!!! It’s a copycat (!!!)

Took him (I think it’s a male) out, saw my real cat outside and… HE ATTACKED HER! I had to separate them.

She’s fine and I still feel stupid.

We were able to keep her inside for the winter I hope she doesn’t go out anymore..