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cortisol levels rise: Hekman JP, Karas AZ, Sharp CR. (2014). Psychogenic Stress in Hospitalized Dogs: Cross Species Comparisons, Implications for Health Care, and the Challenges of Evaluation. Animals. https://doi.org/10.3390/ani4020331
See also: The effect of dog-human interaction on cortisol and behavior in registered animal-assisted activity dogs. Applied Animal Behaviour Science. https://doi.org/10.1016/j.applanim.2014.07.009
See also: Salgirli Demirbas, Y., Isparta, S., Saral, B. et al. (2023). Acute and chronic stress alter behavioral laterality in dogs. Sci Rep. https://doi.org/10.1038/s41598-023-31213-7

potentially permanent: Sinn L. (2019). Puppy & Kitten Socialization. Clinician’s Brief. https://www.cliniciansbrief.com/article/puppy-kitten-socialization
See also: Summerfield J. (2016). The Dark Side of Socialization: Fear Periods and Single Event Learning. Dr. Jen’s Dog Blog. https://www.drjensdogblog.com/the-dark-side-of-socialization-fear-periods-and-single-event-learning/
See also: homeostasis: BCBA Exam Course. The Neuromechanisms of Resilience & Why It Is Vital to Dog Behaviour. Simply Behaviour. http://www.simplybehaviour.com/the-neuromechanisms-of-resilience-why-it-is-vital-to-our-dogs/

doors of the mind: Hale A. (2021). Dog Centred Care: The Emotional Experience of Dogs and their caregivers. https://www.facebook.com/groups/dogcc/posts/1211701976010019/