Natural Remedies for Dog Stress: Evidence Review

Overview: scope and evidence framework

Canine stress can be addressed through both pharmaceutical and non-pharmaceutical means. This guide covers the second category: interventions that do not involve prescription drugs but have been studied in peer-reviewed canine research. The interventions reviewed include nutraceuticals and herbal compounds, dietary approaches targeting the gut microbiome, animal-assisted interventions, environmental enrichment, and acoustic approaches.

Evidence tiers follow the standard Pawsd grading scheme: T1 (systematic review or meta-analysis), T2 (at least one RCT or two independent observational studies), T3 (single observational study), T4 (conflicting evidence), and T5 (narrative review or expert opinion). Most claims in this guide are T3 or T5 because the evidence base for natural interventions is preliminary. Tier and direction are stated with each finding so the reader can judge confidence level.

This guide gives only a brief overview of probiotics, ashwagandha, and mushroom extracts. Each compound has a dedicated Pawsd guide with deeper coverage of the primary literature.

Nutraceuticals and herbal compounds

Nutraceuticals are food-derived compounds with proposed therapeutic properties. A 2025 narrative review described nutraceuticals — including omega-3 fatty acids, prebiotics, probiotics, plant extracts, and dietary supplements — as having antioxidant, anti-inflammatory, immune-modulating, and gut-microbiota balancing properties. The same review noted these properties may contribute to the possible prevention and management of behavioral disturbances, though specific compounds, conditions, and evidence strength were not detailed (Nicotra et al., 2025; PMCID: PMC12568156). The review also acknowledged that drawbacks of use or misuse of such substances have been reported (Nicotra et al., 2025; PMCID: PMC12568156).

A 2025 narrative review of adaptogenic plants described compounds such as ginseng and golden root as supporting cortisol regulation and neurotransmission. However, the authors noted that research on adaptogens in humans is more advanced, there is still a lack of data on their effects in dogs, and further research is needed to confirm effectiveness and safety in animal therapy (Kępińska-Pacelik et al., 2025; DOI: 10.3390/app15105402).

Passiflora incarnata, Withania somnifera, and Taraxacum officinale (herbal blend)

Ciarcia et al. (2025; PMCID: PMC12696704) studied a blend of passionflower, ashwagandha, and dandelion in seven senior dogs. Serum CRP levels were lower at 20 and 40 days compared to baseline (Ciarcia et al., 2025; PMCID: PMC12696704). Serum IL-6 decreased after 20 days and fell further by the end of treatment (Ciarcia et al., 2025; PMCID: PMC12696704). Total antioxidant capacity increased at 40 days (Ciarcia et al., 2025; PMCID: PMC12696704). No significant changes in gut microbiota alpha or beta diversity were found, though the study was likely underpowered to detect such changes (Ciarcia et al., 2025; PMCID: PMC12696704). The absence of a control group limits causal attribution for all of these findings.

Nutraceutical diet combined with behavioral therapy

Cerbo et al. (2017; PMCID: PMC5407696) evaluated a nutraceutical diet combined with counterconditioning and desensitization in 24 dogs with behavioral disturbances primarily attributed to generalized anxiety. Dogs in the combined protocol showed significant improvement in time spent active and at rest after ten days (Cerbo et al., 2017; PMCID: PMC5407696). Because there was no diet-only control arm, the dietary contribution cannot be isolated from the behavioral therapy component (Cerbo et al., 2017; PMCID: PMC5407696).

Ashwagandha and cortisol

A small RCT (n=20) of healthy geriatric dogs found that daily oral ashwagandha root extract at 15 mg/kg significantly reduced serum cortisol levels at day 60 compared to placebo (Bharani et al., 2024; PMCID: PMC11288135). The population was healthy rather than anxious dogs, which limits extrapolation to clinically anxious dogs of other ages. The dedicated Pawsd ashwagandha guide covers this literature in depth.

L-theanine

One study introduction cited evidence that L-theanine, a component of tea, has been shown to play a role in reducing stress and decreasing heart rate in chronic anxiety (Cerbo et al., 2017; PMCID: PMC5407696). This is background context in an introduction rather than a primary study in dogs, and the species and dose specifics are not established by this passage.

The gut-brain axis and dietary factors

The gut-brain axis links the gastrointestinal microbiome to the central nervous system through bidirectional signaling. A narrative review noted that nutrition and social interactions can influence the gut-brain axis, affecting behavior, cognition, and resilience to stress-related disorders, though evidence base and species applicability are not fully specified (Nicotra et al., 2025; PMCID: PMC12568156).

A 2019 narrative review documented that gut microbiota can produce neuroactive molecules including GABA, serotonin, melatonin, histamine, and dopamine (Ambrosini et al., 2019; PMCID: PMC6591269). Bacterial metabolites such as short-chain fatty acids (SCFAs) also stimulate the sympathetic nervous system via the enteric nervous system, with proposed downstream effects on learning and memory, though the complete mechanistic chain has not been tested in a single primary study in dogs (Ambrosini et al., 2019; PMCID: PMC6591269).

Diet meaningfully shapes the canine microbiome. A study of 63 dogs found that diet has a large and reproducible effect on the dog microbiome, independent of breed or sex (Coelho et al., 2018; PMCID: PMC5907387). A high-protein, low-carbohydrate diet was linked to a larger microbiome shift than a lower-protein diet relative to a common baseline (Coelho et al., 2018; PMCID: PMC5907387).

For probiotics, a narrative review noted that although probiotics typically cannot colonize the gut, the metabolites they produce during transit can modify microbiome composition and may improve clinical signs (Pilla et al., 2020; PMCID: PMC6971114). The gut microbiome is otherwise stable in healthy adult dogs, though age, diet, and environmental factors can influence it (Pilla et al., 2020; PMCID: PMC6971114). The dedicated Pawsd probiotics guide covers the anxiety-specific literature in depth.

Omega-3 fatty acids and cognition

A systematic review found that omega-3 fatty acids — specifically EPA and DHA — may provide cognitive benefits in aging dogs and cats, with potentially stronger effects at higher doses, though the authors characterized this as suggesting potential rather than confirmed efficacy (Blanchard et al., 2025; PMCID: PMC12181554). In contrast, supplementing with antioxidants alone, such as polyphenols or vitamins E and C, failed to demonstrate significant efficacy on cognitive function in dogs in the reviewed evidence (Blanchard et al., 2025; PMCID: PMC12181554).

Animal-assisted interventions and the human-animal bond

Animal-assisted interventions (AAIs) are a category of non-pharmaceutical stress modulation in which a dog serves as a therapeutic agent for human stress. The human-animal bond runs in both directions: it can also influence the dog's own arousal and stress regulation.

Animal-assisted interventions for human stress

A systematic review of 10 studies on AAI for trauma found that the research base is preliminary, with a low level of methodological rigor (O'Haire et al., 2015; PMCID: PMC4528099). Across those studies, the most common reported outcomes were reductions in depression, PTSD symptoms, and anxiety (O'Haire et al., 2015; PMCID: PMC4528099). Reduced depression was the most frequent finding, occurring in 6 of 10 reviewed studies (O'Haire et al., 2015; PMCID: PMC4528099). The reviewers concluded that AAI shows promise as a complementary technique but should not be enlisted as the first line of primary treatment for trauma (O'Haire et al., 2015; PMCID: PMC4528099). No reviewed study reported outcomes related to animal welfare, despite therapy dogs being participants with their own welfare needs (O'Haire et al., 2015; PMCID: PMC4528099).

A systematic review of canine-assisted psychotherapy (CAP) for adolescents found that CAP provided additional benefits over standard treatment for internalising disorders and PTSD; the same review reported insufficient evidence that CAP improved coping, subjective wellbeing, or self-esteem beyond standard care (Jones et al., 2019; PMCID: PMC6336278). In one RCT (n=40), adolescents receiving CAP plus standard treatment had a significant decrease in internalising symptoms, and their rate of improvement was significantly better than the standard-treatment-only group (Jones et al., 2019; PMCID: PMC6336278).

The welfare of therapy dogs in AAI is underresearched. A narrative review found that clear conclusions on how performing in AAIs affects a dog's well-being are currently lacking, due to program heterogeneity, small samples, and methodological limitations (Glenk, 2017; PMCID: PMC5332928). Study results suggest that session frequency, environmental novelty, controllability, and recipient age may modulate welfare indicators, but this is based on narrative review of heterogeneous studies (Glenk, 2017; PMCID: PMC5332928).

The human-animal bond and dog stress

The quality of the human-dog relationship has measurable physiological correlates in dogs. In a small cross-sectional study (n=29) of dog-owner pairs, a close emotional bond with the owner appeared to be associated with decreased arousal in dogs, though causal direction cannot be established from this design (Somppi et al., 2022; PMCID: PMC9179432). The Emotional Closeness factor of the Monash Dog-Owner Relationship Scale was related to increased heart rate variability in dogs (p=0.009), consistent with a secure-base effect (Somppi et al., 2022; PMCID: PMC9179432).

Research on dog ownership and child anxiety found that having a pet dog in the home was associated with a lower probability of childhood anxiety in a cross-sectional study of 643 enrolled children (Gadomski et al., 2015; PMCID: PMC4674442). Among the 630 children with complete anxiety-screening data, a lower percentage of those with dogs (12%) met the clinical anxiety screening cutoff than those without dogs (21%), and this association remained significant after controlling for age, sex, poverty level, and parent depression scores (Gadomski et al., 2015; PMCID: PMC4674442). The cross-sectional design precludes causal inference.

Music and environmental modification

Music and acoustic stimuli have been studied as environmental interventions for canine stress, particularly in veterinary and shelter settings. The evidence is mixed and depends on context.

Music during veterinary visits

King et al. (2022; PMCID: PMC8772971) ran an RCT simulating a veterinary exam and found that bespoke classical music did not produce a significant overall effect on dog stress measures. Salivary cortisol, IgA, and infrared temperature all increased from baseline in all conditions, with no effect of music on these physiological markers (King et al., 2022; PMCID: PMC8772971). Dogs' core body temperature was lower with music exposure (p=0.010) (King et al., 2022; PMCID: PMC8772971). The authors noted the veterinary stressor may have been too extreme for music to produce broad stress relief across all measures (King et al., 2022; PMCID: PMC8772971). Dogs were rated as more afraid during physical examination than during kennel housing, regardless of music condition (King et al., 2022; PMCID: PMC8772971).

Music and activity in daily settings

In a crossover RCT of 24 dogs in daily living contexts, a music session reduced activity duration, walking, and resting while increasing inactivity compared to a quiet session (Morris et al., 2021; PMCID: PMC8118201). Whether this change reflects calming or other behavioral effects requires further study (Morris et al., 2021; PMCID: PMC8118201). This music finding was a secondary result in a CBD trial; the activity-reduction pattern during music sessions was statistically robust nonetheless (Morris et al., 2021; PMCID: PMC8118201).

Environmental modification and stress reduction

A narrative review on low-stress veterinary handling noted that a completely stress-free hospital environment is not achievable. However, understanding how to create a low-stress environment benefits patients, staff, and the practice, and minimizing patient stress is achievable in all practices using simple approaches (Lloyd, 2017; PMCID: PMC5606596). The review also acknowledged that many practitioners believe such approaches are too difficult and time-consuming, though the author disputes this view (Lloyd, 2017; PMCID: PMC5606596).

Environmental enrichment combined with an antioxidant-rich diet has been proposed to help manage canine cognitive dysfunction progression and severity. This conclusion comes from a narrative review rather than a controlled primary study (Mihevc et al., 2019; PMCID: PMC6582309).

Evidence gaps and limitations

The natural remedy research for canine stress is fragmented. Studies are typically small, uncontrolled, focused on surrogate biomarkers rather than validated behavioral outcomes, and rarely tested against active comparators. Several limitations recur across modalities.

Small samples and absent control groups. Most nutraceutical and herbal studies in this area involve fewer than 25 dogs and lack control groups — for example, Ciarcia et al. (2025; PMCID: PMC12696704) with n=7 and Cerbo et al. (2017; PMCID: PMC5407696) with n=24 and no diet-only arm. Without a control group, pre-to-post biomarker changes cannot be causally attributed to the intervention.

Healthy rather than anxious populations. Key cortisol findings — such as ashwagandha in geriatric dogs — come from healthy populations. Whether effects replicate in dogs with clinically significant anxiety has not been established in the reviewed literature.

Diverse outcome measures. Studies measure salivary cortisol, CRP, IgA, heart rate variability, and owner-rated behavioral scores in varying combinations. No standardized canine anxiety outcome battery has been adopted across the nutraceutical literature, making cross-study synthesis difficult.

Adaptogens and canine-specific data. There is a recognized lack of data on the effects of adaptogens in dogs, and further research is needed to confirm their effectiveness and safety in animal therapy (Kępińska-Pacelik et al., 2025; DOI: 10.3390/app15105402).

Music intervention scope. The music evidence reviewed here focuses on veterinary clinic contexts. Whether specific music types or protocols produce consistent calming effects in home environments remains underexplored in controlled trials.

Frequently asked questions