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true fear response: Stolzlechner L, Bonorand A, Riemer S. (2022). Optimising Puppy Socialisation - Short- and Long-Term Effects of a Training Programme during the Early Socialisation Period. Animals. https://doi.org/10.3390/ani12223067
See also: Serpell J, Duffy DL, Jagoe JA. The Domestic Dog: Its Evolution, Behavior And Interactions With People. 4th ed., Cambridge University Press, 2015. 98.

scary and not scary: Dehasse J. (1994). Sensory, Emotional and Social Development of the Young Dog. The Bulletin for Veterinary Clinical Ethology. http://www.joeldehasse.com/articles/a-english/puppy.html
See also: Stolzlechner L, Bonorand A, Riemer S. (2022). Optimising Puppy Socialisation - Short- and Long-Term Effects of a Training Programme during the Early Socialisation Period. Animals. https://doi.org/10.3390/ani12223067
See also Vaterlaws-Whiteside H, Hartmann A. (2017). Improving puppy behavior using a new standardized socialization program. Applied Animal Behavior Science. https://doi.org/10.1016/j.applanim.2017.08.003
See also: Battaglia C. (2009). Periods of Early Development and the Effects of Stimulation and Social Experiences in the Canine. Journal of Veterinary Behavior. https://doi.org/10.1016/j.jveb.2009.03.003

radical effect: Serpell J, Duffy DL, Jagoe JA. The Domestic Dog: Its Evolution, Behavior And Interactions With People. 4th ed., Cambridge University Press, 2015. 97-99.
See also: Kayla Fratt, Journey Dog Training. Puppy Culture and Puppy Development with Jane Lindquist, Pandemic Puppy (podcast), May 21, 2021.

unique stage of development: Serpell J, Duffy DL, Jagoe JA. The Domestic Dog: Its Evolution, Behavior And Interactions With People. 4th ed., Cambridge University Press, 2015. 98-99.
See also: Jessica Hekman, DVM, Ph.D.: What Makes Dogs’ Brains Tick. Fenzi Dog Sports Academy (podcast), episode 109, April 12, 2019. https://www.fenzidogsportsacademy.com/blog/e109-jessica-hekman-dvm-phd-what-makes-dogs-brains-tick

unequaled at any other time: Gross B, Garcia-Tapia D, Riedesel E, Ellinwood NM, Jens JK. (2010). Normal canine brain maturation at magnetic resonance imaging. Vet Radiol Ultrasound. doi: 10.1111/j.1740-8261.2010.01681.x.
See also: Colman, S. (2020). The Biology of Early Learning. Whole Dog Journal. https://www.whole-dog-journal.com/training/the-biology-of-early-learning/

forever lost: Serpell J, Duffy DL, Jagoe JA. The Domestic Dog: Its Evolution, Behavior And Interactions With People. 4th ed., Cambridge University Press, 2015. 99-100.
See also: Stolzlechner L, Bonorand A, Riemer S. (2022). Optimising Puppy Socialisation - Short- and Long-Term Effects of a Training Programme during the Early Socialisation Period. Animals. https://doi.org/10.3390/ani12223067

memory consolidation: Hecht J. (2017). Memory Wins When Dogs Sleep. Scientific American. https://blogs.scientificamerican.com/dog-spies/memory-wins-when-dogs-sleep/
See also: Kis A et al. (2017). The interrelated effect of sleep and learning in dogs (Canis familiaris); an EEG and behavioural study. Sci Rep. doi: 10.1038/srep41873

work against the brain’s ability: Coren, S. (2017). Train Too Much and a Dog Won’t Remember. Psychology Today. https://www.psychologytoday.com/us/blog/canine-corner/201704/train-too-much-and-dog-wont-remember

dogs sleep better: Kis A, Gergely A, Galambos Á, Abdai J, Gombos F, Bódizs R, Topál J. (2017). Sleep macrostructure is modulated by positive and negative social experience in adult pet dogs. Proc Biol Sci. doi: 10.1098/rspb.2017.1883. 

visual cortex: Peterson ME, Kutzler MA. (2011). Small Animal Pediatrics. Missouri, Saunders, 2011. 97.

does not easily allow: Peterson ME, Kutzler MA. (2011). Small Animal Pediatrics. Missouri, Saunders, 2011. 97.