One of my biggest complaints about the original collage posted here is the central dog portrait. That has to be the highlight shot, IMO. And, what bothers me is that you can only see one eye. In fact, all the images only show a side shot. Do you have any sharp 2-eyes portraits?

Having said that, I agree that it's all too busy. All suggestions here are excellent. My poodle client wants me to create a collage for her. I'll likely be putting it up here for critique, too. :-) Something to keep me busy this coming weekend.