^ It all depends on how the nodes in the neural network are weighted... I think you see a lot of animal features in a lot of deepdream images just because it's guaranteed to give trippy results.
This is a cool video about how deep dream works
https://www.youtube.com/watch?v=BsSmBPmPeYQedit: actually those nodes are weighted heavily just because it was trained on a dataset with lots of pictures of dogs and cats.