By "dream", I mean:
- Dreaming while sleeping.
- Dreaming about their future life while being awake.
Thank you in advance.
According to this Psychology Today blogpost, it is quite likely that animals can dream. Particularly mammals that according to the blogpost:
However, for your second question, I do not think it is at all possible to know what they are dreaming about (if they indeed do dream).
From the ScientificAmerican
Although the linked article doesn't look like they were talking about animals. But I wont purchase the article to check that...