A sequence of action shots is easy with most cell phones by simply dragging down as your taking a photo. As an example, here I was below the dog's eye level, and took a sequence of 20 photos as the retriever retrieved a greenhead I just shot. Then I picked out my favorite action shot from the sequence of 20 photos. Since the dog is moving right to left, top to bottom, I try to have "negative space" in the photo for the dog to move into.