I did a search and found it is not easy to find lists of fears around the world, because they tend to switch from phobias (which are often described as irrational) to real problems (like climate change, economic instability, and nuclear war). Here’s a list that maps to a lot of items on the dream list, but the teeth thing still has me confused, unless it is a spin on aging in general:
I’m not able to see the link about squirrels, the site gives me a permission error. 
Still, the theme of animals is another interesting one. It reminds me of folktales, because so many ancient ones feature animals in some way:
Could dreams/nightmares somehow be related to those tales - or a form of genetic memory passed down as a means of ensuring survival or facilitating adaptation to conditions in nature? 
