Broom, D. M. (2007). Welfare and behavioral needs of animals. Journal of Applied Animal Welfare Science, 10(3), 243-254.
Clutton-Brock, T. (2016). The evolution of social behavior in mammals. Journal of Mammal Evolution, 23(2), 151-164. Broom, D
Lindsay, S. (2009). Canine Behavioral Medicine. Wiley-Blackwell. S. (2009). Canine Behavioral Medicine. Wiley-Blackwell.