Do animals that dream also have nightmares, and are the causes the same as in people?

There can be nightmare scenarios that are created by their minds. And this serves the same purpose, it is a healing and cleansing sequence during which they find a better way to process the energies, to let them go. And while not as sophisticated as with human, this is a very similar reworking of the energy that allows the animal to clear it. Normally, they dispense with negativity very quickly in their experience, so they can heal as they go, with encountering most sources of negativity, or will do so within a short interval after an experience takes place. There are some awarenesses that come during the dream state, from the akashic records, and so there is, as well, some parallel awareness of the collective unconscious of the animals of similar species. And so, they will have a parallel issue, at times, of coping with the negativity they attract, in this fashion, and will process it and release it, and will do so much more efficiently and effectively than humans, because they have less inner wounding, and the events will not have accumulated to such breadth and depth as to be too formidable a challenge to be processed and worked through in one sitting, and then will pile up across time as has happened with human beings.