I have a mixed breed puppy (we think). We got our dog from a rescue society. He could be sleeping and all of a sudden he has the hiccupps. They only last about a minute or two. Is this something I should worry about?

I don't think it requires immediate attention. Might make a note to ask the vet about it next time you are in for shots or something. Thank you for adopting a mixed breed. So many nice dogs, and too few homes. Come back anytime with questions.