Victoria you can put in an offer however you should note that most short sales require you to close within 30 days of approval. It is alot of time and work to go through the short sale process. If you put the seller and agent through the process which takes time and money, you need to be ready to close. Many agents would not take an offer on a short sale with a home sale contingincy.
Please see my blog with tips and advice on buying a short sale.