A Breeder’s Advice: When Dogs in the Same Home Start Fighting
As a breeder, one of the most important things I tell families with multiple dogs is this: not every disagreement between dogs is a sign that one dog is “bad,” dominant, or trying to take over the household. Dogs, just like people, have different personalities, tolerances, and preferences, and sometimes two dogs simply struggle to live comfortably together.
When dogs in the same household begin fighting, the priority should always be safety first, followed by understanding what is causing the tension.
First: Prevent the Dogs From Practicing the Fighting
If your dogs are repeatedly getting into fights, don’t simply hope they will “work it out.” Every fight can increase tension and make future fights more likely.
Use management to prevent opportunities for conflict:
Separate dogs with baby gates, doors, crates, pens, or other secure barriers.
Feed dogs separately, particularly if there is any food guarding.
Give high-value chews, bones, toys, and treats separately.
Don’t allow dogs to compete over beds, couches, doorways, or access to people.
Take them outside separately if necessary.
Don’t leave dogs together unsupervised if you are concerned they may fight.
Make sure children cannot accidentally open gates or doors and put the dogs together.
Management is not a failure. It is an important part of keeping everyone safe while you work on the underlying problem.
Look Beyond the Fight
One of the biggest mistakes owners make is focusing only on what happened immediately before the fight.
Perhaps one dog approached another while it had a bone. Perhaps one dog walked through a doorway. Perhaps someone was sitting beside their favourite person on the couch.
That event may have been the trigger, but it isn’t necessarily the entire reason for the aggression.
A dog’s overall stress level matters.
Think of it like a bucket. Every stressful experience adds a little more to the bucket. Pain, lack of exercise, changes in routine, visitors, loud noises, anxiety, poor sleep, frustration, resource guarding, or tension with another dog can all add to that stress. Eventually, the bucket can overflow, and something that normally wouldn’t cause a problem may trigger a fight.
This is why I encourage owners to look at the whole picture, rather than assuming the dogs are simply fighting over one particular thing.
Common Things That Can Increase Tension
Consider whether any of these are affecting your dogs:
Competition over food or treats
Bones, chews, or favourite toys
Competition for attention from people
Favourite sleeping areas or furniture
Doorways and narrow spaces
Visitors coming into the home
Dogs outside the window
Barking at passers-by
Changes in routine
Lack of exercise or mental stimulation
Loud noises, thunderstorms, or fireworks
Trips to the veterinarian
Grooming or nail trimming
Pain or illness
Anxiety or fear
Tension between the dogs themselves
Stress within the household
You may find that there isn’t one single cause. Often, there are several small stressors occurring at the same time.
Always Consider Pain or Illness
If a normally tolerant dog suddenly becomes aggressive toward another dog, a veterinary examination should be one of your first steps.
Dogs can be very good at hiding pain. Arthritis, dental problems, ear infections, injuries, gastrointestinal discomfort, or other medical issues can make a dog much less tolerant of being approached or touched.
A dog that is hurting may react defensively when another dog gets too close, even if the other dog hasn’t done anything wrong.
A sudden change in behaviour should never simply be dismissed as a training problem.
Learn Your Dogs’ Warning Signs
Before a serious fight, dogs often communicate that they are uncomfortable.
You may see:
Stiffening of the body
Hard staring
Turning away
Lip licking
Freezing
Growling
Showing teeth
Blocking another dog
Raising the hackles
Avoiding or guarding a particular area or resource
Don’t punish a dog for growling. A growl is valuable communication. It is the dog’s way of saying, “I’m uncomfortable. I need space.”
Instead of punishing the warning, listen to it and safely create distance.
Resource Guarding Is Common
Food is only one possible resource.
Dogs may guard:
Food bowls
Bones and chews
Toys
Beds
Furniture
Doorways
Crates
A favourite person
Access to another room
If one dog is guarding a resource, don’t force the dogs to share it.
There is nothing wrong with giving each dog their own safe space and allowing them to enjoy valuable resources separately.
Lower the Overall Stress Level
Once you have identified potential stressors, start reducing them wherever possible.
Give your dogs appropriate daily exercise and mental stimulation. Maintain a predictable routine. Make sure they have quiet places where they can rest without being disturbed.
Training can also help because it gives dogs clear communication and predictable expectations.
I strongly recommend reward-based training. Dogs learn best when we teach them what we want them to do rather than relying on intimidation, physical corrections, or punishment.
Helping Dogs Change Their Feelings About Each Other
Once the dogs can be safely managed, behaviour modification may be appropriate.
The basic idea is to allow the dogs to see each other at a distance where neither dog is becoming frightened, frustrated, or aggressive, and then pair that experience with something positive, such as very high-value food.
For example:
Keep the dogs far enough apart that they can notice each other without reacting.
The moment Dog A notices Dog B, provide a high-value treat.
Dog B receives treats as well.
After a short period, separate them again.
Repeat this many times.
Gradually increase the duration they can calmly see one another.
Only decrease the distance when both dogs are consistently relaxed.
If either dog becomes tense, increase the distance again.
The goal is not to force the dogs to interact. The goal is to change their emotional response from “That dog is a problem” to “That dog appearing predicts something good, and I can remain calm.”
This process needs to be gradual. Moving too quickly can set you back.
Don’t Force a Friendship
This is particularly important.
Your goal does not necessarily need to be for the dogs to become best friends.
Sometimes success simply means that two dogs can safely and calmly live in the same household while respecting each other’s space.
Some dogs enjoy playing together. Others prefer to coexist peacefully without interacting much. That’s perfectly acceptable.
What If They Are Already Fighting?
If your dogs are repeatedly fighting, or if either dog is causing significant injury, I would not recommend trying to solve the problem on your own.
Separate the dogs and seek professional help.
Look for a qualified, reward-based behaviour professional who has experience dealing with aggression between household dogs. Your veterinarian can also help rule out medical problems and may recommend referral to a veterinary behaviourist when appropriate.
Most importantly, don’t put your hands between fighting dogs. People are frequently bitten when attempting to physically separate dogs during a fight.
Sometimes Permanent Management Is Necessary
As difficult as it may be to hear, some dogs simply may not be compatible as housemates.
That doesn’t mean either dog is bad.
If two dogs cannot safely live together, responsible ownership may mean maintaining permanent separation, finding an appropriate new home for one dog, or, in the most serious and unmanageable cases, discussing all available options with your veterinarian and qualified behaviour professional.
Rehoming should always be done honestly and responsibly, with the dog’s behavioural history fully disclosed so that an appropriate home can be found.
My Advice as a Breeder
If you have two dogs who have suddenly started fighting, don’t panic and don’t immediately blame either dog.
First, keep everyone safe. Then look at what may have changed.
Ask yourself:
Is one dog in pain?
Are they competing over something?
Has their routine changed?
Are they getting enough exercise and rest?
Are there environmental stressors?
Are we giving them enough individual space?
Are we accidentally putting them into situations where conflict is likely?
And remember that prevention is far easier than repeatedly breaking up fights.
Dogs don’t need to share everything. They don’t need to sleep together, eat together, play together, or have access to every resource at the same time.
Sometimes the kindest thing we can do for our dogs is to give them space, respect their individual needs, and manage the household in a way that sets everyone up for success.
If the situation is serious, don’t wait for a bad fight to happen. Get professional help early. The sooner you address the problem, the more options you generally have for creating a safe and peaceful household.
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