Anxiety in Dogs: The Root-Cause Approach

Anxiety in dogs is usually a symptom of something physical, not a fixed personality trait. The two root causes that get missed most often are unrecognized pain and an imbalanced gut. In referral behavior caseloads reviewed by veterinary behaviorists, a painful condition was suspected in 28 to 82 percent of dogs sent in for a behavior problem. And the gut makes and regulates many of the same signaling chemicals that govern mood. So the honest first move with an anxious dog is a physical one, before any calming chew, collar or training plan.

An anxious dog is far more often a dog in pain, or a dog with an imbalanced gut, than a dog with a bad temperament.

You have read the lists. Thundershirt. White noise. A calming chew from the pet shop. Maybe a plug-in diffuser, a tired-dog-is-a-good-dog walk, and a training app you paid for and stopped using in week three.

And your dog still paces at 2am.

Here is what most pet parents are never told clearly. Almost every article about an anxious dog starts from the assumption that the anxiety is the problem. In a large share of cases, it is not. It is the message. Something in the body is sending it, and until you find out what, you are managing a signal instead of answering it.

I learned this the slow way, with a different symptom. Milka, our French Bulldog, spent her first year with chronic diarrhea, hot spots and vomiting we woke up to in the night. Countless vet visits. "Premium" kibble. Expensive meds. Every single one of them aimed at the symptom in front of us, and every vet we saw told us it was normal for the breed. When we finally changed what was going into her rather than what we were putting on top, it cleared in days. She is eleven now, a healthy senior with a white snout.

We were stunned. Relieved. Grateful. But also angry, because nobody had asked the obvious question first. This article is me asking it about anxiety.

What does anxiety in dogs actually look like?

It rarely looks like a cowering dog in a corner. That is the picture in stock photos, and it is the reason so many anxious dogs go unnoticed for years.

The signs pet parents actually describe to us:

• Pacing, circling, or an inability to settle in the evening
• Barking or whining that starts before you have even picked up your keys
• Licking, chewing paws, or licking a spot on the floor or sofa repeatedly
• Panting with no heat and no exercise to explain it
• Startling at sounds that never used to bother them
• Sudden avoidance of other dogs, or of a specific room or route
• Accidents in the house from a dog who has been reliable for years
• Destructive behavior in the first thirty minutes after you leave

This is more common than most people realize. In a survey of 13,715 Finnish pet dogs across 264 breeds, 72.5 percent showed at least one highly problematic anxiety-related behavior. Noise sensitivity was the most common at 32 percent, and general fearfulness came next at 29 percent. Those researchers also found large differences between breeds, which points to a real genetic component alongside everything environmental.

If the whole picture sits inside your absence, that is a specific pattern with its own name and its own plan. Milka has it, we still work around it, and I wrote the whole thing up in our guide to separation anxiety in dogs.

So no, you did not imagine it, and no, you are not the only one. What matters now is which of the causes below is driving it in your dog.

Could my dog's anxiety actually be pain?

This is the question I would ask first, and it is the one almost nobody asks first.

In 2020, a group of clinical animal behaviorists and veterinary behavior specialists published a review in the journal Animals looking at their own recent caseloads. Across 100 recent dog cases, a conservative estimate put a painful condition in roughly a third of referred behavior cases. Across the wider set of caseloads the authors contributed, the figure ranged from 28 percent to 82 percent depending on the clinic. Their conclusion was blunt: it is better to address suspected pain first, rather than considering it only after behavior work has failed.

The sources of pain they saw most were musculoskeletal, with hips and stifles at the top of the list, but painful gastrointestinal and skin conditions showed up too.

There is a second study worth knowing about, because it gives you something concrete to look for. In 2018, researchers at the University of Lincoln compared dogs referred for noise sensitivity who had musculoskeletal pain against dogs referred for the same thing who did not. The dogs in pain developed their noise sensitivity on average nearly four years later in life. They also generalized much more widely, avoiding not only the place the bad experience happened but much larger areas, and they were less social with other dogs.

Read that again, because it is the most useful paragraph on this page.

Three checks before you assume the anxiety is behavioral:

1. When did it start? A fear that appears in a middle-aged or senior dog who was fine at three is a physical question until proven otherwise. Early-life fear is more likely developmental.
2. Has it spread? A dog who was scared of fireworks and is now scared of the street, the car and the hallway is generalizing. That widening pattern showed up in the dogs with pain, not the dogs without.
3. What changed physically around the same time? Slower on stairs. Sitting crooked. Reluctant to be touched over the hips. Stopped jumping onto the sofa. A gap in the walk they never used to need.

If two of those three ring true, book the physical exam before you buy anything, and say the word pain out loud in the appointment. Ask specifically for a hip, stifle and spinal assessment rather than a general once-over. For dogs whose restlessness turns out to be discomfort-driven, particularly seniors and dogs recovering from an injury or surgery, a herbal option such as HerbAprin for comfort and relaxation sits alongside your vet's plan rather than replacing it.

How does the gut affect a dog's mood?

The second root cause is the one PAWDEGA has been talking about for years, and the veterinary literature has now caught up with it properly.

In 2024, a review in Veterinary Medicine International set out the gut-brain axis in dogs specifically. The short version: the microbes living in your dog's intestine influence the brain through several routes at once. They affect metabolism, they signal along nerve pathways including the vagus nerve, they interact with the hormonal stress system that releases cortisol, and they shape immune signaling. When that microbial community falls out of balance, a state called dysbiosis, the intestinal barrier can become more permeable, inflammatory messengers rise, and the stress axis gets pushed into overdrive.

It also runs the other way. Chronic stress changes the composition of the microbiome, which then feeds back into the stress response. That loop is exactly why so many anxious dogs also have inconsistent stools, and why so many itchy, gassy, sensitive-stomach dogs are also the nervous ones. It is one problem wearing two faces.

The practical question is whether changing the microbiome changes the behavior. There is now peer-reviewed evidence in dogs that it can. A randomized, placebo-controlled trial published in Animals in 2025 tested a Lactiplantibacillus plantarum strain in dogs over five weeks and reported improvements in anxious and aggressive behavior, more regular sleep, and easier adjustment when their people left the house, with no side effects reported. Research on Bifidobacterium longum in anxious Labradors has pointed the same way, though much of that work has been presented at conferences rather than published in full, so hold it a little more loosely.

This is not a fringe idea any more. It is the mechanism, and it is why a calming chew that does nothing about the gut tends to stop working after a couple of weeks. If you want the longer explanation of why unrelated-looking symptoms keep tracing back to digestion, we wrote about dog gut health as the root of whole-body wellness here.

What should I change first?

Order matters more than the shopping list. Here is the sequence I would give a friend.

1. Rule out pain. Physical exam, with hips, stifles and spine named specifically. Do this even if your dog seems physically fine, especially if the fear started later in life.
2. Look at the bowl. Highly processed food is the single biggest daily input into the microbiome. Moving to fresh or raw food, or even adding fresh food alongside what you feed now, changes the input rather than layering a supplement on top of it.
3. Support the gut-brain axis directly. A species-appropriate probiotic, given daily and given time, is the piece most people skip because it does not feel like it is aimed at the anxiety.
4. Add situational support for the hard moments. Fireworks, the vet, the car, the two hours after you leave. This is where a calming oil earns its place, as a bridge rather than a plan, and when you give it matters as much as what you give.
5. Keep the training going. Positive reinforcement, desensitization and counter-conditioning still do the heavy lifting on the learned part of the fear. Supplements make a dog available to learn. They do not do the learning.

Most pet parents do step four and step five, skip one, two and three, and then conclude that natural support does not work for their dog. It is not that it failed. It was aimed at the wrong layer.

Do calming herbs and hemp oil actually work?

Here is where I want to be straight with you, because this is the section most brands write dishonestly.

Chamomile. The evidence here is good, and it is human. A randomized, double-blind, placebo-controlled trial of 57 adults with mild to moderate generalized anxiety found a significantly greater drop in anxiety scores on chamomile extract than on placebo. A later randomized trial found long-term use helped hold those reductions in moderate to severe cases. What there is not, yet, is an equivalent controlled trial in dogs. Chamomile is the active herb in an organic blend like Organic Daily Calm Supplement, alongside thyme and ginger, and I am comfortable recommending it. I am not comfortable telling you a human trial proves anything about your dog.

Hemp and cannabidiol. The dog research is real, and it is genuinely mixed. What almost nobody points out is that the trials which worked and the trials which did not differed in one obvious way: the amount given, and how long before the frightening thing it was given. That is the whole subject of the next section, and it is the most practical thing on this page.

Adaptogens and mushrooms. Ashwagandha is the one people ask about most. We looked at what the research on ashwagandha for dogs actually shows in a separate piece, including where the evidence runs out.

My honest position, after years of this: herbs and oils are the most visible part of a calming plan and the least important part of it. They make a hard evening easier. They do not change why the evening is hard.

When should I give the calming oil?

Hours before the thing your dog is frightened of, not as you pick up your keys. By the time your hand is on the door handle, her heart rate climbed a while ago.

This is the single most common reason a pet parent decides a calming product does not work. It was never given a fair test. In a randomized, placebo-controlled study at the Waltham Petcare Science Institute, dogs were given a single dose of cannabidiol and then put through a separation event or a car journey two hours later. Those dogs were rated significantly less sad, whined less, and had lower cortisol than the placebo group. Two hours was the design, not a detail. By contrast, a University of Kentucky study that fed a much smaller amount as a daily chew and then ran a fireworks soundtrack found no change in cortisol or fear behaviors at all.

The oil in the bundle above, CALM, is a liquid for exactly this reason. You can move the dose earlier or later and give it on the gums rather than in the bowl, which matters when you are working to a deadline you already know about.

I have set out the full pre-departure timing protocol we use with Milka, including the clock, the amounts, and the free layers that did as much as the oil did. If you have a dog who falls apart when you leave, read separation anxiety in dogs and why the timing matters more than the product next. It is the detailed version of this section.

How long before I see anything?

I would rather give you the real range than a flattering one.

Situational support like a hemp oil works on the timescale of hours, given ahead of the trigger rather than during the meltdown. The gut work is slower. The probiotic trial above ran for five weeks before measuring, and most of the research in this area uses four to six week windows. Six weeks of consistent daily use is the minimum I would judge anything on.

What tends to move first is not the headline fear. It is sleep, settling in the evening, and how quickly your dog recovers after a trigger rather than whether the trigger lands at all. Write down where you are starting, because the change is gradual enough that you will forget what week one looked like.

Dogs who have been unwell for years, who have been through several courses of medication, or who are still eating highly processed food, take longer. That is not a reason to lower your expectations. It is a reason to keep going past week three.

What do I say to my vet?

Please keep in mind that I'm not a veterinarian, and this isn't medical advice. I am a pet parent who has spent years reading this research and talking to holistic and integrative vets. Every pet is unique, so I always recommend working alongside your vet, ideally a holistic or integrative one, especially for anything ongoing or serious.

If your dog is on anxiety medication, do not change or stop it on the strength of a blog post, including this one. That conversation belongs with the person who prescribed it.

What you can do is walk in with better questions. Try these:

• Can we assess for pain specifically, including hips, stifles and spine, before we work on this as a behavior problem?
• This fear started when he was seven. Does that timing change what you would look for?
• His stools have never been consistent. Could the gut and the behavior be connected here?
• If we address a physical cause, how would we tell whether the behavior responds?

Those questions are not a challenge to your vet. They are the questions the 2020 Animals authors were asking their own profession to ask more often. If you want a second opinion from someone who works this way by default, we keep a list of holistic vets offering online consultations.

Where should I start?

There are two honest starting points, and which one is right depends on one question: does your dog have gut symptoms alongside the anxiety?

If your dog has both, start with the gut. The calm follows the gut far more reliably than the gut follows the calm. If you are not sure whether the gut is involved, the signs to look for are set out in our piece on leaky gut in dogs.

And whichever you choose, book the physical exam. If there is one thing I want you to take from this page, it is that an anxious dog deserves to be checked for pain before anyone decides the problem is in his head.

The second thing I would want you to take is smaller and harder. Stop looking for what works on dogs and start watching what works on yours. Which room she chooses. Which door she waits at. Which point in your leaving routine her body changes. We spent years trying general answers on a very specific dog, and watching Milka properly was worth more than any of them.

You are not powerless here. You are the person who noticed.

Much love,
Larry

Sources

• Mills DS, Demontigny-Bédard I, Gruen M, et al. Pain and Problem Behavior in Cats and Dogs. Animals, 2020. mdpi.com
• Lopes Fagundes AL, Hewison L, McPeake KJ, Zulch H, Mills DS. Noise Sensitivities in Dogs: An Exploration of Signs in Dogs with and without Musculoskeletal Pain Using Qualitative Content Analysis. Frontiers in Veterinary Science, 2018. ncbi.nlm.nih.gov
• Salonen M, Sulkama S, Mikkola S, et al. Prevalence, comorbidity, and breed differences in canine anxiety in 13,700 Finnish pet dogs. Scientific Reports, 2020. nature.com
• Sacoor C, Barros LM, Montezinho L. Gut-Brain Axis Impact on Canine Anxiety Disorders: New Challenges for Behavioral Veterinary Medicine. Veterinary Medicine International, 2024. onlinelibrary.wiley.com
• Bijaoui EMM, Zimmerman NP. Efficacy of a Novel Lactiplantibacillus plantarum Strain (LP815) in Reducing Canine Aggression and Anxiety: A Randomized Placebo-Controlled Trial. Animals, 2025. ncbi.nlm.nih.gov
• Amsterdam JD, Li Y, Soeller I, Rockwell K, Mao JJ, Shults J. A randomized, double-blind, placebo-controlled trial of oral Matricaria recutita (chamomile) extract therapy for generalized anxiety disorder. Journal of Clinical Psychopharmacology, 2009. pubmed.ncbi.nlm.nih.gov
• Mao JJ, Xie SX, Keefe JR, Soeller I, Li QS, Amsterdam JD. Long-term Chamomile (Matricaria chamomilla L.) treatment for generalized anxiety disorder: A randomized clinical trial. Phytomedicine, 2016. pmc.ncbi.nlm.nih.gov
• Hunt ABG, Flint HE, Logan DW, King T. A single dose of cannabidiol (CBD) positively influences measures of stress in dogs during separation and car travel. Frontiers in Veterinary Science, 2023. frontiersin.org
• Morris EM, Kitts-Morgan SE, Spangler DM, McLeod KR, Costa JHC, Harmon DL. The Impact of Feeding Cannabidiol (CBD) Containing Treats on Canine Response to a Noise-Induced Fear Response Test. Frontiers in Veterinary Science, 2020. pmc.ncbi.nlm.nih.gov