Recent research[1] has found a fovea like structure on the canine retina. Fovea is a small patch of the retina with increased density of visual receptors. The finding suggests that the dogs has better visual acuity than previously suspected.

Quite likely this visualization were programed before this new development.

[1]: http://www.sciencedaily.com/releases/2014/03/140305191513.ht...