I read a lot of articles on the internet about how dog see the the world. But I can't find the source of these study. I want to know how did scientist setup the experiment to find out animal vision. I don't know which keyword should I use to search for the information on the internet. Can anybody please send me some research paper about the problem?
While their work was in the cat rather than the dog, your starting point should be the work of Hubel and Wiesel. They are the indisputable pioneers for vision research in general. They won the Nobel Prize in 1981 for Physiology and Medicine.
Hubel, D.H. and Wiesel, T.N. (1962). Receptive fields, binocular interaction and functional architecture in the cat's visual cortex, The Journal of Physiology, 160(1), 106-154.
Wurtz, R.H. (2009). Recounting the impact of Hubel and Wiesel. The Journal of Physiology, 587, 2817-2823. DOI
Jacobs, G.H. 1993. The distribution and nature of colour vision among the mammals. Biological Reviews 68: 413-471.
Neitz, J. et al. 1989. Color vision in the dog. Visual Neuroscience 3: 119-125.