I like to see the color of a dogs eyes too, BUT, I want to see it done with light,not processing. Only because the pupils look wrong with it done later.

This dog really probably has darker eyes than it shows, due to the light. See the differnce in the pupils? And the catchlights.

I just don't want to see something that looks just, well, almost HDR-ish on animals. Not unless you are going for a funky look