Introducing a New Cat to
the Household

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by Arnold Plotnick MS, DVM, ACVIM, ABVP

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At MCS, we get asked about this all the time. Many techniques have been described in a variety of books and magazines, making the topic confusing in general. 

It is impossible to know in advance how the social structure will develop in a home when a new cat is being introduced to one or more cats in a home. It is unlikely that all of the cats will act friendly to one another right away.  More likely, one or more of the cats will show some degree of defensive behavior (ears flattened, hissing, crouching) for a little while. In some instances, the defensive behavior is short-lived, and the cats get along. In other instances, mutual defensiveness will escalate to aggressive behavior in which one cat runs and the other cat chases after it.  

A more troubling situation occurs when a cat will, from the beginning, relentlessly pursue another cat, constantly looking for it, and chasing it once it finds it.  This, fortunately, is uncommon, but it usually indicates that this is a very territorial cat and that the prognosis is poor.  In these cases, it is not prudent to simply put the cats together and hope for the best. It is even worse to let the cats “fight it out”.  Cats that are highly aroused and are displaying moderate or high levels of defensiveness can quickly redirect their aggression to anything that moves and can seriously injure people and other animals.             

In the long run, the safest and fastest method is to keep the cat separated at first.  If the cats seem to be playful and social and not afraid, the introduction can take place quickly.  The owners should be present to supervise the session, and provide interactive toys to maintain the play behavior.  If there is a little defensiveness, then the cats should be separated and another introductory session should be conducted.  This method of introduction usually requires only a few sessions a day, for a few days, before success is achieved. 

If one cat becomes very frightened and hides, then that cat should be confined to a room by itself with food, water, and a litter box, until it explores, plays and shows social behavior with people.  The introduction between cats will have to be much more gradual, so as to avoid any defensiveness.  Initially there should be no visual contact, i.e. a closed door, with a towel across the bottom so that there is no contact at all.  Later, removing the towel usually allows a little bit of visual contact, as most doors have a gap of approximately ˝ to 1 inch.  In many cases, the cats will soon be playing with each others’ paws under the gap.  Once this occurs, the door can be opened a tiny bit, with supervision, allowing further play through the crack in the door.  If the cats do not play, interactive cat toys such as string or feathers can be used to attract the cats to the gap, and then be encouraged to play. The goal is to the sighting of the paws under the door with play.  If the cats play through the crack, they can be introduced to each other in the room together.

Sometimes, the visual contact cannot progress directly from “feet” to “cat”, and has to be even more gradual. A screen door or baby gate may need to be placed across the threshold between rooms, with a cloth draped over the screen to reduce visual contact.  Small holes can be cut in the cloth to provide gradually increasing visual contact during play.  Visual contact is maintained at a low enough level to elicit curiosity and can be increased gradually once there is some evidence of social behavior.  If the cats seem defensive or aggressive at any point, visual contact should be reduced again.  Only after the cats are social and playful in full view of each other should they be allowed to interact together, without the barrier (with supervision, of course). Full integration into the household usually is accomplished within a week or two, but can take as long as a month or two. 

 

Updated 9/23/07