I got it right. I have two cats. One of them was just diagnosed with feline diabetes and I am giving her insulin twice per day. She almost got ran over and killed once and then I saved her life again when she got a bad infection after she was spayed, so I want my kitty to have nine lives. I love the little sweetie!
I noticed in the show "La Casa del Papel" when watching with subtitles that the actors saying "siete" turned into "nine" in the subtitles. I thought it was a strange mistake at first, but then it turned out to be a reference to the number of lives a cat has, so yeah, apparently seven in Spanish.