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number one reason: Powell L. et al. (2021) Relinquishing Owners Underestimate Their Dog’s Behavioral Problems: Deception or Lack of Knowledge? Frontiers in Veterinary Science. https://www.frontiersin.org/articles/10.3389/fvets.2021.734973/full#B1
See also: Serpell J, Duffy DL, Jagoe JA. The Domestic Dog: Its Evolution, Behavior And Interactions With People. 4th ed., Cambridge University Press, 2015. 102.

frontal cortex: Madson, C. (2023) What to Expect When Your Puppy Becomes a Teenager. Preventive Vet. https://www.preventivevet.com/dogs/teenage-puppy-behavior

sensitive period: Serpell J, Duffy DL, Jagoe JA. The Domestic Dog: Its Evolution, Behavior And Interactions With People. 4th ed., Cambridge University Press, 2015. 98-101.

secure attachment: Konok V, Marx A, Farago T. (2018). Attachment styles in dogs and their relationship with separation-related disorder - A questionnaire based clustering. Applied Animal Behavior Science. https://doi.org/10.1016/j.applanim.2019.02.014

no distinct time frames: Serpell J, Duffy DL, Jagoe JA. The Domestic Dog: Its Evolution, Behavior And Interactions With People. 4th ed., Cambridge University Press, 2015. 101-102.

recent landmark study: Asher L, England GCW, Sommerville R, Harvey ND. (2020). Teenage dogs? Evidence for adolescent-phase conflict behaviour and an association between attachment to humans and pubertal timing in the domestic dog. Biol Lett. doi: 10.1098/rsbl.2020.0097. 

sensitive period: Serpell J, Duffy DL, Jagoe JA. The Domestic Dog: Its Evolution, Behavior And Interactions With People. 4th ed., Cambridge University Press, 2015. 98-101.

adult teeth: Donovan L. (2021). A Timeline of Puppy Teething. AmericanKennelClub.org. https://www.akc.org/expert-advice/health/timeline-of-puppy-teething/

research shows: Kubo KY, Iinuma M, Chen H. (2015). Mastication as a Stress-Coping Behavior. Biomed Res Int. doi: 10.1155/2015/876409.
See also: Flint HE, Atkinson M, Lush J, Hunt ABG., King T. (2023). Long-Lasting Chews Elicit Positive Emotional States in Dogs during Short Periods of Social Isolation. Animals. https://doi.org/10.3390/ani13040552

Second Fear Period: Sinn L. (2019). Puppy & Kitten Socialization. Clinician’s Brief. https://www.cliniciansbrief.com/article/puppy-kitten-socialization
See also: Asher L, England GCW, Sommerville R, Harvey ND. (2020). Teenage dogs? Evidence for adolescent-phase conflict behaviour and an association between attachment to humans and pubertal timing in the domestic dog. Biol Lett. doi: 10.1098/rsbl.2020.0097.
See also: Mendez E. Small Animal Theriogenology. Elsevier, 2023. 1205.

regression: Asher L, England GCW, Sommerville R, Harvey ND. (2020). Teenage dogs? Evidence for adolescent-phase conflict behaviour and an association between attachment to humans and pubertal timing in the domestic dog. Biol Lett. doi: 10.1098/rsbl.2020.0097.