Rainbow Dash the Pony (from My Little Pony: Friendship is Magic) is voiced by Ashleigh Ball, the same girl who voices Gilbert Troodon the Troodon formosus (from Dinosaur Train).
 
You can immediately tell it’s Ashleigh when you first hear Gilbert and Rainbow speak.
 
By the way, Ashleigh also does the voice of Applejack (you know) on MLPFIM. On DT, she also plays Lorraine Lambeosaurus the Lambeosaurus lambei, Arnie Argentinosaurus the Argentinosaurus huinculensis and more.
 
Ashleigh, if you see this, I just want to let you know that you’re awesome.
 
PS: I gave Gilbert downy fuzz to make him more realistic