The other rabbit

This book didn't really speak to me. I just have too many questions about this strange universe in which all the animals have just one counterpart. Why can't they hang out with other species and be happy? Why are all the animals the same size, except for some birds and some fish? How come the groups of small birds and fish act as one creature when it comes to finding their counterpart? How come the dragon didn't know that there was another dragon? All the other animals seem to be aware that they're searching for someone. How come everyone is such a jerk once they meet their counterpart? They all just abandon the rabbit after saying they were going to help him! Oh sure, I'll help you find your counterpart, just oh wait no there's another dog here now so we're going to do dog things forever don't ever bother us again and we don't care if you find the other rabbit go away now.