For many people, an ideal home is one that includes furry four-legged friends. There’s no doubt that it can be very fulfilling to have multiple cats and dogs co-existing in your home. However, it’s crucial that you understand the best practices for introducing new pets to one another. It’s vitally important to not only ensure your pets get familiar with each other, but also it helps to keep them safe, prevent fights and competition for your attention, and ensure a more harmonious household for everyone living in it.
Let’s explore the top dos and don’ts of introducing new pets to each other together.
DO: Preventive Care, Vaccines, and Medical Status
One of the key elements of safety for the resident pet is vaccination against preventable disease. The same holds true for the new adoption; minimizing the risk of disease begins with vaccination and parasite prevention (flea, worm prevention, etc.). You must know the medical status of the new adoption thoroughly to understand care needed and compatibility with your lifestyle and routines of the resident pet. A thorough physical exam at your trusted veterinary office is very important.
DO: Address Reproductive Status First
Before introducing new pets—particularly those of the same sex—it is highly recommended that both the resident and new pet are spayed or neutered. Intact animals are influenced by reproductive hormones that significantly increase the risk of territorial disputes, resource guarding, and severe hormonal aggression. Ensuring all pets are altered prior to their introduction removes these underlying biological triggers, providing the safest possible baseline for them to establish a peaceful, co-existing relationship in your home.
DO: Get to Know the Pets Yourself First
Before introducing a new pet to other animals, learn about them yourself first. Are they more submissive to you as their owner, or dominant in their personality? Are they curious and playful, or are they more timid? Do they like to be touched, or do they prefer to have more personal space? Answering these questions as you get to know your newest pet helps make for a smoother pet introduction later on.
DON’T: Rush Your Pets
We realize as much as you would love to see pets getting along right away, the truth is that it takes time to properly introduce pets. Remember that it may take multiple attempts to get them used to each other before they start to get along. Don’t rush this process—the more time you take in the beginning, the better the bond between your pets may be.
DO: Remember the Importance of Scent
Scent is a major part of the way animals socialize. You can help progress the introduction period by letting pets smell each other’s scent before they see each other. Give the new pet a room of their own (with their own food, water, crate, litter, etc.) and have your other pets come to the closed door. This lets them start to get familiar with the new pet’s scent, which can help make the actual introduction easier. Pheromone diffusers such as Feliway for cats and Adaptil for dogs can be very useful tools to make the introduction positive and help to proactively manage the environment.
DON’T: Allow Full Access to the New Pet Right Away
Allowing unrestricted contact between new pets right away is not a good idea. That’s because you run the risk of a fight happening, which could sour relations between the new housemates right away. Instead, start slowly. Let them smell each other and vocalize through a closed door. You can also do the same thing with a baby gate or a similar obstacle, which lets pets see each other without physically contacting each other.
DO: Encourage Good Introductions
When an introduction goes well, always reward your animals. If they sniff each other without any fighting or similar behaviour, reinforce this reaction with lots of praise, pets, treats, toys, or whatever else makes the pets happiest. This can help them associate the introduction with a pleasant experience.
If your pet has a known anxiety towards other animals, it may be best to resist the temptation of adding to the family to prevent unnecessary triggers.
DON’T: Push Past Their Emotional Threshold
It’s normal for the first few attempted introductions to be tense or even hostile. Our Fear Free philosophy dictates that a pet’s emotional state must be prioritized over forced socialization. If you notice signs of distress—such as a cat flattening its ears and puffing its tail, or a dog excessively panting, yawning, or hiding—stop the introduction immediately. Never force an interaction if an animal is pushed past their threshold; separate them and give them time to decompress.
DO: Use High-Value Rewards
When rewarding pets for their behaviour during a smooth introduction, use their favourites. By rewarding pets with their preferred treats, toys, and activities, they’ll gradually form a positive association with the other animal.
DON’T: Make the Introductions Too Long
Introductory pet greetings, especially the first few ones, should be short ones even if they’re going well. Do whatever you can to end these encounters on a high note to ensure a positive association for the next one.
DO: Use Neutral Ground
When bringing a new pet into a home that already has a pet or pets, it’s best to make the first couple of introductions somewhere other than at home. This ensures your current pets don’t feel uncertain about the newcomer.
DON’T: Allow Fighting
When you start to allow your pets to physically contact each other, it’s important to watch them and prevent any fighting. If your pets do start to fight, separate them right away and isolate them from one another. This prevents injuries, lets tensions cool down, and ensures that a rivalry doesn’t develop between them.
DO: Provide Individual Resources
It’s important that all pets have their own food, water, litter, and so on—especially in the early days of welcoming a new pet to the home. If they’re forced to share, a submissive pet might end up yielding their resources to a more dominant one. If they’re both dominant, it can lead to fights and competition over resources, which is counterproductive to a healthy introductory phase.
In multi-cat households, the gold standard is providing one litter box per cat, plus one extra. Forcing pets to share can trigger severe resource guarding and unnecessary conflict.
DON’T: Force Pets to Meet
While it might seem like your new pet would get along with your current ones if they’d just give it a try, you should never force new pets to meet or interact. It’s important that both pets have the option to escape if they feel like they need to, so never hold your pet during introductions or prevent their exit. This can lead to conflicts and slow down the acclimation process, i.e. the process of pets becoming familiar with new environments and animals.
DO: Pay Attention to Body Language
Both cats and dogs have specific behaviours that can indicate stress or fear. This varies from animal to animal, however some of the more common signs include flattened ears, a stiffened and puffed up tail, or hiding away. In other cases, pets might growl, hiss, or attack nearby people and animals. Pay attention to these signs—if one pet is getting stressed, stop the introduction and try again the next day.
DON’T: Overlook Personalities
Individual animals have very different personalities, and factoring these into the introduction process is vital to success. A high-energy dog can easily overwhelm a more reserved cat, while a bombastic, dominant cat might alarm a shy dog. This is why it’s so important to understand all animals as individuals before you attempt to introduce them to each other. The more you know about your pets and their personalities, the better you can accommodate their specific needs while introducing them.
DON’T: Rely Solely on “Working It Out”
Please note that while your veterinary team can assist with the medical management of anxiety, Hastings Veterinary Hospital does not provide behavioural training. If your pets continue to show severe reactivity or aggression despite a slow introduction, we strongly recommend consulting a board-certified veterinary behaviorist or a certified positive-reinforcement trainer to assist with behavioral modification.
Forming Lifelong Bonds Between Pets
When done correctly, an introduction between new pets is the foundation for long-lasting bonds, even between animals of different species. Remember that this process requires time, patience, and attention on your part as the pet owner.
It’s very important to understand that some animals may simply not be fond of each other and may not end up being happy under the same roof. As difficult as it may be, there exists a possibility that some animals are the happiest solo. With the right approach, your pets can become courteous, then friends, and eventually, family.
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