Stress and Its Physiological Effects in Pets

 

Evidence synthesis describing neuroendocrine, behavioral, and systemic physiological correlates of stress in companion animals across clinical, environmental, and social contexts.

Evidence Position Summary

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• Stress in dogs and cats is associated with measurable neuroendocrine activation, particularly hypothalamic–pituitary–adrenal axis engagement and cortisol-related biomarkers (Mârza et al., 2024), (Ogi et al., 2023).

• Acute and chronic stress states are associated with behavioral alterations and multisystem physiological changes involving immune, gastrointestinal, metabolic, and autonomic parameters (Mills et al., 2014; Dias-Souza et al., 2025).

• Veterinary clinical environments, handling techniques, hospitalization, environmental change, and social contexts are repeatedly identified as stress-associated conditions (Gazzano et al., 2025; Hekman et al., 2014).

• Evidence includes controlled experimental trials, observational studies, narrative reviews, and owner-reported data, each presenting distinct inferential constraints.

• Reported findings reflect associations rather than causation unless derived from controlled experimental designs.

What This Evidence Page Covers

 

This page synthesizes peer-reviewed evidence on physiological stress responses in dogs and cats, including neurobiological mechanisms, validated and emerging biomarkers, behavioral correlates, and stress-associated contexts such as veterinary care, environmental disruption, social influences, and chronic exposure. Distinctions between experimental and observational evidence are explicitly maintained.

Evidence Breakdown

 

Neuroendocrine and Physiological Stress Pathways

 

Stress-related activation of neuroendocrine systems in dogs and cats is consistently documented, with cortisol dynamics described as a central physiological marker across experimental and observational literature (Mârza et al., 2024), (Ogi et al., 2023). Reviews of anesthetic and surgical stress further describe autonomic and neurobiological alterations linked to perioperative stress exposure (Hernández-Ávalos et al., 2021).

 

Narrative and integrative reviews describe downstream physiological effects involving immune modulation, oxidative balance, gastrointestinal physiology, and metabolic indicators across both acute and prolonged stress contexts (Mills et al., 2014; Dias-Souza et al., 2025).

 

Behavioral Correlates and Stress Indicators

 

Behavioral patterns associated with physiological stress include altered activity levels, vigilance, avoidance responses, and changes in task-related performance. Controlled studies involving shelter dogs and standardized veterinary handling contexts report concurrent behavioral and physiological stress markers during routine examinations (Gazzano et al., 2025; Squair et al., 2023).

 

Observational and cross-sectional studies involving hospitalized and owned pets associate behavioral indicators with physiological stress measures, while emphasizing the challenges of subjective assessment and inter-individual variability (Hekman et al., 2014; Lefman et al., 2019).

 

Veterinary Clinical and Environmental Stressors

 

Veterinary visits, hospitalization, handling techniques, and exposure to unfamiliar environments are repeatedly evaluated as stress-associated conditions. Controlled mock-veterinary-visit studies document measurable physiological stress responses under standardized exposure scenarios (King et al., 2022). Environmental modification studies in laboratory dogs describe physiological stress responses associated with housing and routine changes (Lee et al., 2023).

 

Additional environmental stressors, including air travel, thermal exposure, and shelter housing, are primarily examined through observational, pilot, or narrative study designs (Venable et al., 2016; Hennessy et al., 2020).

 

Social and Human–Animal Stress Interactions

Observational research examines associations between human stress states and companion animal stress indicators. Owner stress, occupational rumination, and exposure to novel environments are associated with correlated physiological and behavioral stress measures in dogs, often relying on owner-reported or indirect data sources (Byrne et al., 2024; Mitropoulos et al., 2025).

 

Human–animal interaction literature, including studies of pet presence, mental activation, and pet-related stimuli, predominantly evaluates human stress outcomes, with indirect implications for interpreting companion animal stress responses (Ein et al., 2018; Harvie et al., 2025).

 

Chronic Stress, Welfare, and Long-Term Effects

 

Chronic stress indicators in dogs and cats include sustained alterations in cortisol-related measures, behavioral change patterns, and welfare-associated parameters. Reviews and observational analyses describe prolonged exposure scenarios involving shelter environments, service roles, and extreme social or environmental conditions (Prykhodchenko et al., 2024; Holopura et al., 2024).

 

Emerging research explores computational and technological approaches to detecting and classifying chronic stress, with limited external validation across species and settings (Tripp et al., 2022).