Roles performed by dogs that sometimes sees them classified as working dogs include:
"working dog". Collins Dictionary. HarperCollins Publishers L.L.C. 2020. Retrieved 21 January 2020. a dog of suitable breed or training kept for its practical use, such as herding sheep, rather than as a pet or for showing https://www.collinsdictionary.com/dictionary/english/working-dog
"working dog". Merriam-Webster. 2019. Retrieved 21 January 2020. a dog suitable by size, breeding, or training for useful work (such as draft or herding) especially as distinguished from one suitable primarily for pet, show, or sporting use https://www.merriam-webster.com/dictionary/working%20dog
"working dog". Lexico. Oxford University Press. 2019. Archived from the original on January 26, 2020. Retrieved 21 January 2020. A dog trained to work with livestock. https://web.archive.org/web/20200126055509/https://www.lexico.com/definition/working_dog
Olson, Patricia N. (1 August 2002). "The modern working dog—a call for interdisciplinary collaboration" (PDF). Journal of the American Veterinary Medical Association. 221 (3): 352–355. doi:10.2460/javma.2002.221.352. PMID 12164529. Archived from the original (PDF) on 26 January 2020. Retrieved 22 January 2020. https://web.archive.org/web/20200126055512/https://www.avma.org/sites/default/files/resources/javma_221_3_352.pdf
Olson, Patricia N. (1 August 2002). "The modern working dog—a call for interdisciplinary collaboration" (PDF). Journal of the American Veterinary Medical Association. 221 (3): 352–355. doi:10.2460/javma.2002.221.352. PMID 12164529. Archived from the original (PDF) on 26 January 2020. Retrieved 22 January 2020. https://web.archive.org/web/20200126055512/https://www.avma.org/sites/default/files/resources/javma_221_3_352.pdf
"British Carriage Dog Society". 2018-01-29. Archived from the original on 29 January 2018. Retrieved 2022-04-11. https://web.archive.org/web/20180129184331/http://carriagedog.org/BCDS/Welcome
Olson, Patricia N. (1 August 2002). "The modern working dog—a call for interdisciplinary collaboration" (PDF). Journal of the American Veterinary Medical Association. 221 (3): 352–355. doi:10.2460/javma.2002.221.352. PMID 12164529. Archived from the original (PDF) on 26 January 2020. Retrieved 22 January 2020. https://web.archive.org/web/20200126055512/https://www.avma.org/sites/default/files/resources/javma_221_3_352.pdf
"Working dog". Encyclopædia Britannica. Encyclopædia Britannica, Inc. 2019. Retrieved 21 January 2020. any of various breeds of dog bred as guard, herding, draft, or rescue animals. https://www.britannica.com/animal/working-dog
"Working dog". Encyclopædia Britannica. Encyclopædia Britannica, Inc. 2019. Retrieved 21 January 2020. any of various breeds of dog bred as guard, herding, draft, or rescue animals. https://www.britannica.com/animal/working-dog
"Working dog". Encyclopædia Britannica. Encyclopædia Britannica, Inc. 2019. Retrieved 21 January 2020. any of various breeds of dog bred as guard, herding, draft, or rescue animals. https://www.britannica.com/animal/working-dog
Rogak, Lisa (2011). The dogs of war: the courage, love and loyalty of military working dogs. New York: Thomas Dunne Books. ISBN 9781250008817. 9781250008817
Hall, S.S.; Gee, N.R.; Mills, D.S. (2016). "Children reading to dogs: A systematic review of the literature". PLOS ONE. 11 (2): e0149759. doi:10.1371/journal.pone.0149759.{{cite journal}}: CS1 maint: unflagged free DOI (link) /wiki/Doi_(identifier)
Olson, Patricia N. (1 August 2002). "The modern working dog—a call for interdisciplinary collaboration" (PDF). Journal of the American Veterinary Medical Association. 221 (3): 352–355. doi:10.2460/javma.2002.221.352. PMID 12164529. Archived from the original (PDF) on 26 January 2020. Retrieved 22 January 2020. https://web.archive.org/web/20200126055512/https://www.avma.org/sites/default/files/resources/javma_221_3_352.pdf
Coppinger, Raymond; Schneider, Richard (1995). "Evolution of working dogs". In Serpell, James (ed.). The domestic dog: its evolution, behaviour and interactions with people. Cambridge: Cambridge University Press. pp. 21–50. ISBN 0521425379. 0521425379
Glover, John. (2014). Ratting With Terriers. Suffolk, England. Skycat Publications. ISBN 9780993022302 https://www.google.ca/books/edition/Ratting_with_Terriers/_erMsgEACAAJ?hl=en
"Working Group". The Kennel Club. The Kennel Club Ltd. 2020. Retrieved 21 January 2020. https://www.thekennelclub.org.uk/services/public/breed/Default.aspx?group=WKG
"Working Group". American Kennel Club. American Kennel Club, Inc. 2020. Retrieved 21 January 2020. https://www.akc.org/dog-breeds/working/
"Working Dogs". Canadian Kennel Club. 2020. Retrieved 22 January 2020. https://www.ckc.ca/en/Choosing-a-Dog/Choosing-a-Breed/Working-Dogs
"Group 5 (Working Dogs)". Australian National Kennel Council. Australian National Kennel Council Ltd. 2015. Archived from the original on 24 February 2018. Retrieved 22 January 2020. https://web.archive.org/web/20180224035120/http://ankc.org.au/Breed/Index/5
"Standards of the breeds: Group 5 – Working Dogs" (PDF). New Zealand Kennel Club. Dogs New Zealand. 2020. Retrieved 22 January 2020. https://www.dogsnz.org.nz/pdfs/bs-working.pdf
"FCI breeds nomenclature". Fédération Cynologique Internationale. 2020. Retrieved 22 January 2020. http://www.fci.be/en/Nomenclature/