I don't think I started getting my first bear dreams, and general animal attacks until sometime after I started back-packing in the mountains. Mid to late twenties. There have been some that have been pretty scary. I remember waking up once very relieved that I would never be putting myself in a situation where I could possible encounter a bear ever again. But now I have the cabin and I go camping out in the woods all alone at night, lol. In actuality I'm not very worried about it. Only slightly.
I don't like the idea of running into one at all. But I'm fairly confident that if I do I'd likely be able to scare it off pretty easily. It would still be unsettling though. Can only imagine what kind of dreams actually seeing a bear in the wild would inspire, lol.
Now days those kinds of dreams are just a matter of course for me. I just have fun with them, even if sometimes they still can be scary. But I've gotten Lucid from bears and other animal attacks several times and that's always fun when it happens. In the most recent one, I encountered a black panther and recognized it as a dreamsign but didn't actually end up getting Lucid. That one didn't actually attack me either.
Really scary nightmares have been pretty common for me throughout my entire life. Lucid Dreaming has really helped me out in that department. Now I don't really care how scary they get. The more scared I become the more likely I'll realize I'm dreaming, then it's all good. And facing nightmares Lucid is probably about my favorite Lucid activity.
I just don't like the ones that involve loved ones being harmed or killed. Those are emotionally the worst kind.