Adjusting to a new home can be a frightening and anxious experience for a cat who may have
been bounced from one or more homes, to a shelter, and then to you. Do not be discouraged if
your new and resident pets do not become immediate friends. It can take many cats 8 to 12
months to develop a friendship. Others may never become friends and simply learn to live
together by mutual avoidance. Occasionally, one cat must be re-homed because the animals will
not stop fighting.
While there is no definitive way to determine whether your cat will get along with a particular
animal, often the cats that adjust easiest are those who've lived previously with other animals, or
are still kittens. Older cats that have never been around other animals may have the most difficult
Regardless of the age or background of the cat you've adopted, it's important to remember that
cats are territorial and must be introduced to other animals gradually to help prevent fearful or
aggressive responses. Below are some tips and tricks to help increase the chance your adopted
cat will accept - and be accepted by - the rest of your furry family. Prior to bringing a new pet
home check with your veterinarian to ensure all your resident pets are healthy (as well as your
Note: Keep in mind that while some cats will be able to breeze through each step after only a
couple of days, other cats will require weeks at each step
before they are able to take the introductions further. Be
patient and allow your cat the freedom to move through
each step at his or her own comfort level.
Step one: Creating a good first impression
During the early stages of the introduction period it's
important that your new and resident pets can smell and
hear one another but not touch. To prevent accidental
face-to-face confrontations confine your cat to a medium-
sized room with her food, water, litter box and a bed.
Plan ahead for your pet's arrival by ensuring your resident pets are temporarily confined until your new cat is in her room.
To help your pets associate positive experiences with one another start feeding their meals on
either side of the door to this room so they are in close proximity. At first their dishes should be
placed at least a few feet apart on each side. If they remain calm, gradually move the dishes
closer until they can eat comfortably standing directly on either side of the door. If either animal
has a negative reaction, move the dishes further apart and repeat the process at a slower pace.
Step two: Building familiarity
Allowing your pets to gradually become accustomed to
each other's scents is an important part of the introduction
process. Two excellent ways to exchange scents include
rubbing a towel on your new addition and putting it under
the food dishes of the resident pets (and vice versa), and
switching beds or sleeping blankets between your
resident pets and your new cat.
Once your new and resident pets have a chance to
become familiar with each other's scents using these
methods, and your new cat is eating regularly and using
his litter box in the room he's been confined, switch it so
that your resident pets are confined to the new cat's room
and your new cat is free to roam the house. This allows
your pets to have yet another chance to adjust to each
other's scents, and gives the new cat freedom to calmly
explore his new home.
Step three: Allowing for peek-a-boos
Once you've returned your pets to their original designated parts of the house you can start the
peek-a-boo process. Use two doorstops to prop open the dividing door enough to allow your new
and resident pets to see each other while eating. Over a period of days (or longer if necessary) try
feeding your pets at a distance from the door gradually bringing the dishes closer together if all
pets display calm behaviours. Close the door when you are not there to supervise.
Step four: Making the introductions (cat-to-cat)
When you first allow your cats to meet each other face-to-face be prepared for a slight protest
from either cat on occasion. Do not allow these behaviours to develop further. If either animal
becomes fearful or aggressive, separate them, and start back at step one taking small, gradual
steps forward again. When minor spats occur between your cats - such as posturing, hissing or
growling - you can safely separate your pets by making a loud noise, using a squirt bottle with
water or throwing a pillow.
It's important to note that sometimes when pets are introduced a pet makes play signals that are
interpreted by the other pet as aggression. If this occurs, separate your pets and contact your
veterinarian or an animal behaviourist immediately for assistance.
To help ease the adjustment period for your cats ensure that you have one extra litter box than
there are cats (e.g. two cats, three litter boxes), watch to ensure that the cats don't "ambush" each
other when trying to use the litter box, and keep the resident pets' schedules close to what they
were before the newcomer's arrival.
Introducing your cat to your dog
Because dogs have strong jaws, are typically much larger than cats, and have a natural tendency
to want to chase and play with cats (who typically become fearful and defensive) - caution is
needed when making introductions. Be particularly careful of dogs with high prey drives. Some
dogs should never be left alone with cats without supervision. To safely introduce a cat and dog
to each other take the steps referred to above in addition to the following precautions.
Ramping up training
Training is invaluable to help teach your dog to behave
appropriately around cats. Work on improving your dog's
response to sit, down, stay, come and attention commands
so she can respond reliably with distractions. If you need
help, join a positive reinforcement training class. Modern
trainers use humane and fun techniques such as "lure-
rewarding" (using treats to lure dogs into position), and
"clicker training" (marking the exact moment the dog is
doing the desired behaviour using a small device that
makes a "click" - followed by feeding a treat).
When your cat and resident dog are comfortable eating on
opposite sides of the door (as described in steps one to
three) you can start the gradual process of introducing
your pets to one another. Use two people in this exercise
to help ensure the introductions are safe and positive. One person should take the dog on leash to
a corner of the room and have him lie down and stay for treats. Have a second person offer your
cat tasty pieces of food at the opposite end of the room. Repeat this exercise many times (keep
the sessions short and successful rather than long and stressful for the animals) gradually
bringing your pets closer together as long as they continue to show calm behaviour.
If the controlled introductions are going smoothly when your dog and cat are close together, keep
your dog on leash in a down-stay position but allow your cat some freedom to explore your dog
at his own pace. Praise and give treats for calm behaviour. If your dog pops out of position
quickly reposition your dog in a down posture using a tasty treat as a lure.
Note: If your cat shows fearful behaviour and runs away, or becomes aggressive, go back to the
previous introduction steps at a slower pace. Also, if you are concerned your dog may jump up
during introductions and startle your cat, you can "ground" the leash. To do so, step on the leash
at the point where it touches the ground if your dog is standing. If he attempts to jump to say
hello, the leash will momentarily tighten, and he will correct himself. Give him lots of rewards
for calm behaviour. Ensure your dog is wearing a flat collar - not a choke chain or prong collar
- which can cause him to associate pain and/or discomfort with the presence of the cat.
Teaching dogs math: cats = good things happen
If you are constantly stressed or punishing your dog when your cat is nearby, such as keeping the
leash taunt, popping the leash or yelling at your dog - and "good things" never happen to your
dog in the cat's presence - your dog may come to associate these negative experiences with your
cat and redirect aggression towards her. Consequently, it is important that you give your dog
treats and praise whenever she is calm around your cat, and whenever she responds to your
requests to sit, come or lie down. Help her be successful with treats! In the early stages of
introduction you can give lots of treats, however, as your dog adjusts to the cat and noticeably
becomes more relaxed in her presence you can give treats randomly and with decreasing
Protecting unsupervised cats, kittens and puppies
Throughout the introduction process ensure your dog is
on leash, supervised, and well treated for good behaviour
and good responses to requests. If you are not home keep
pets in separate areas of the house or set up barriers, such
as baby gates, to limit your dog's freedom and give your
cat "dog-free" zones he can retreat to for safety if needed.
Kittens, because of their small size, should not be left
unsupervised around dogs. Cats are generally safe around
puppies, as a well socialized cat can put a puppy in its
place; however, shyer cats may not be so bold and need
to be separated until the puppy is older and learns self-
Protecting small animals
If you own small pets that are the natural prey of cats -
such as rodents, birds and fish - ensure they are protected
from possible harassment from the new cat. Never leave your pets together unsupervised until
you are sure they can peacefully coexist. Often the best and safest solution is to keep your small
animals in a separate area of the house. Small pets can be stressed simply by the presence of your
Calling for extra help
If introductions go poorly, early intervention and advice from a professional is recommended to
increase the likelihood the conflict can be resolved and to reduce the risk of injury from a pet
fight. Recommended professionals include animal behaviourists, veterinarians, or dog trainers if
a dog is involved. Do not attempt to punish any of your pets as this can easily make the situation
worse and make the pets more aggressive or fearful. Fortunately, with professional guidance
most pets can learn to live together peaceably.