I'm (vaguely) thinking of getting another car to keep my indoor cat company. I might be wrong but I think her life is quite boring and that she might be happier with a bit of feline company. My friend moved back to the area a couple of months ago with her outdoor cat. She's moved from rural(ish) Wales to central London and her cat isn't going out at all through choice - not even into her garden. The bottom line is that we want to introduce the two cats to each other to see how they get on i.e. she'll bring her cat to my flat. I know you're supposed to introduce cats gradually when taking them on permanently into a household that already has cats. I just want to see how she reacts to another cat not having met one before i.e. will it be curiosity, outright hostility etc. My friend's cat has flea treatment (which my cat doesn't have due to always haviing been indoors). Are there any other health risks to introducing an outdoor cat to an indoor cat?