I've ALWAYS had cats, but I've NEVER had this kind of situation. Now that Coda will be coming up here, how should I go about the introduction of him and Heidi? Usually when introducing a new cat into my house, I make sure my original cats know they are not being replaced. In this case, they will both feel they are the original cat! I've been away from Coda for 9 months, but during that 9 months Heidi has been only cat. She has been sleeping in the spot that has always been Coda's spot (curled right up against my left side).