Why Is My Dog Suddenly Reactive? 3 Reasons Behavior Can Change
Sudden reactivity is a serious cause of concern for dog owners. If your otherwise non-reactive dog is suddenly acting reactive, or they’ve suddenly become more reactive than usual, there are a few possibilities to explore. They may be experiencing pain or a medical issue, reacting to a triggering or traumatic event, experiencing changes as they age, exhibiting new behaviors from a slow build up of stress, or experiencing frustration from a new household or environmental dynamic.
Here’s what to consider if your dog is suddenly displaying new signs of reactivity:
3 potential reasons for new dog reactivity
New reactivity could be a medical issue
Sometimes new reactive behavior stems from a medical issue causing pain or other symptoms. As Dr. Athena Angela Gaffud, DVM, previously told us, many dogs are more receptive to training and behavioral changes after their owners have identified and managed their medical issues.
She shared that osteoarthritis, dental disease, ear infections, spinal pain, and gastrointestinal discomfort can all lower a dog’s stress tolerance and make them more reactive or defensive.
If you can’t rule out any obvious causes that could cause behavioral changes, it’s likely time to visit a veterinarian. They can assess your pet for any medical conditions and changes contributing to their behavior.
A recent stressful event can trigger reactive behavior
If your dog is suddenly displaying reactive behavior, try to think back to any recent events that could have triggered them.
Consider the following:
Did your dog recently have a negative encounter with another dog? Maybe they were aggressive toward or even snapped at your dog. Any interaction where your dog felt unsafe or scared could impact their confidence and trigger reactivity. It’s why we recommend never going to the dog park with a reactive dog. There are simply too many risks.
Have any minor triggers stacked up recently? Maybe your dog is stressed when they hear a lawnmower and your neighbor has been tending to their lawn more lately. Or maybe a new family moved into the neighborhood and walks their dog more frequently.
Have there been any environmental or familial changes? A new home, a new family member, or even changes to your daily routine can cause a dog to start acting reactively.
Sometimes owners can overlook seemingly small things that impact their dog’s sense of safety and wellbeing.
Aging and life changes can impact behavior
Although many people expect their dog to continue to become more calm and relaxed as they age, many experience new behavioral changes from getting older.
According to The American Animal Hospital Association (AAHA), “behavioral anomalies in senior pets may include house soiling, changes in elimination patterns, decreases/changes in interactions with other pets or humans, onset of aggression in a normally nonaggressive dog, disorientation, poor problem solving (e.g., getting stuck behind doors), changes in sleep patterns, changes in vocalization, and recent onset of novel phobias.”
If your dog is getting older and displaying new reactive behavior, it may simply be tied to the aging process. But that doesn’t mean you should write it off. A visit to the veterinarian is a good next step. As the AAHA recommends, “There are medications, diets, supplements, and behavioral or environmental interventions that can help aging dogs and cats and improve their quality of life and that of their owners. All interventions work best if they can be implemented as soon as possible after onset of the problem.”
How to help a dog experiencing new reactivity
If your dog has suddenly begun to display signs of reactive behavior, you have a few options. First, see if you can tie it back to a recent triggering event or an increase in environmental triggers. If so, you’ll want to work on desensitizing your dog to the triggers through slow exposure and working within your pet’s threshold.
But if your dog’s reactivity could be tied to a medical issue, it’s important to see a vet before making any other changes. They will have the right advice for your dog’s specific needs.
FAQ for sudden reactivity in dogs
What causes new reactivity?
Your dog may be experiencing pain or a medical issue, reacting to a triggering or traumatic event, experiencing changes as they age, exhibiting new behaviors from a slow build up of stress, or experiencing frustration from a new household or environmental dynamic.
When should I see a vet for sudden reactivity?
If you can’t pinpoint a recent environmental trigger or traumatic experience, you may want to get your dog evaluated for any medical concerns. To learn more, check out our piece about when it’s time to visit the vet for reactivity.
Can reactive dogs get better?
Yes, most reactive dogs can get better. But you won’t have any success modifying their behavior until you’ve identified the cause of their reactivity.
What is trigger stacking?
You’ll often hear the term trigger stacking when discussing reactive dog behavior. It means a build up of stress from multiple triggering (whether stressful or exciting) events in a short period with little recovery time.
If my dog doesn’t have a medical issue, how can I help their new reactivity?
You can work with a trainer to learn how to better work with your dog. Or you can learn more about dog behavior and reactivity with articles, books, or even online videos. Don’t Worry, He’s Friendly has a library of resources you can use to learn more.
Don’t Worry, He’s Friendly helps reactive dogs thrive in the city. Check out our other articles to learn more about reactive dog training.
This content is for educational purposes only and is not a substitute for professional veterinary, behavioral, or training advice.