[Error: unknown template qotd]What a stupid question. What type of animal? Some certainly do - humans do. We're animals. Non-human animals? I don't know. Again, it depends on the animal. I doubt my goldfish regret much. A gorilla might feel regret in a less complex way to a human. My dictionary (I know I'm looking too much into this) says regret is to "feel sad about the loss or absence of" something. Dogs get sad when you go away. Hey, even my rabbit gets sad when we go away. So in answer to the question: Yes. At least some animals. Humans at the very least.