狗为啥改变不了不食屎：为什么狗总改不了吃屎

参考资料

[1] Hart BL, Hart LA, Thigpen AP, Tran A, Bain MJ. The paradox of canine conspecific coprophagy. Vet Med Sci. 2018 May;4(2):106-114.

[2] McKeown D, Luescher A, Machum M. Coprophagia: Food for thought. Can Vet J. 1988 Oct;29(10):849-50.