Dog vomiting all over?

Ok so when I woke up this morning I come to find my dog has threw up everywhere it's an orange and is sorta chunky it's kinda like wet orange sand I went on to school though (after cleaning that up) and when I got home there was three more but the had been dryed up so they must have been from this morning as well any idea as to what this is? She's a 3yr old Yorkie.