Zax, D. (2007, June 30). A Brief History of House Cats. Retrieved May 13, 2018, from https://www.smithsonianmag.com/history/a-brief-history-of-house-cats-158390681/
Science, L. (2018). Timeline: A History of Cats and Dogs. Retrieved from https://www.livescience.com/45424-timeline-history-of-cats-and-dogs.html
Pets in America. (2018). Retrieved from https://books.google.com/books?id=NNrlt_jPKHAC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
Ault, A. (2018). Ask Smithsonian: When Did People Start Keeping Pets?. Retrieved from https://www.smithsonianmag.com/smithsonian-institution/ask-smithsonian-when-did-people-start-keeping-pets-180960616/
Kelly, D. (2018). Smartest dog breeds in the world. Retrieved from http://www.grunge.com/98499/smartest-dog-breeds-world/sl/labrador-retriever
Jacobson, L. (2018). The History of Dogs as Pets. Retrieved from https://abcnews.go.com/Lifestyle/history-dogs-pets/story?id=41671149
Stranden, A. (2018). How the wild rabbit was domesticated. Retrieved from http://sciencenordic.com/how-wild-rabbit-was-domesticated
Science, L. (2018). Timeline: A History of Cats and Dogs. Retrieved from https://www.livescience.com/45424-timeline-history-of-cats-and-dogs.html
Pets in America. (2018). Retrieved from https://books.google.com/books?id=NNrlt_jPKHAC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
Ault, A. (2018). Ask Smithsonian: When Did People Start Keeping Pets?. Retrieved from https://www.smithsonianmag.com/smithsonian-institution/ask-smithsonian-when-did-people-start-keeping-pets-180960616/
Kelly, D. (2018). Smartest dog breeds in the world. Retrieved from http://www.grunge.com/98499/smartest-dog-breeds-world/sl/labrador-retriever
Jacobson, L. (2018). The History of Dogs as Pets. Retrieved from https://abcnews.go.com/Lifestyle/history-dogs-pets/story?id=41671149
Stranden, A. (2018). How the wild rabbit was domesticated. Retrieved from http://sciencenordic.com/how-wild-rabbit-was-domesticated