Makes sense. Not sure if non ponies would have magic in the, but one could say every living thing may have some, maybe slight or faint for stuff like squirrles, butterflies ect. And I have heard that someone on a podcast said that Lauren Faust commented that earth ponies have their own magic, so ponies may have more magic then most other animals do. Dragons too I'd guess, considering they breath fire and can eat anything, gems, stuff that would make ponies very sick but they find tasty, ect.