I've never tried introducing my two cats with Corktwo because he's been outdoors his whole life and I worry that he could carry diseases and I don't want to expose my cats to that. When I take him in to get nuetered I hope I have enough money to get him test for FIP and FIV. But I'm just a college kid as it was hard enough comming up with the money to get him fixed. As much as I love cats I can't afford to spend too much money on a stray.