My 2 year old mini Dauchaund ate approximately 2 ounces of cheddar cheese 3 nights ago. She has not had a bowel movement for 2 days. Now her abdomen is swolen like a large stick of sausage. What should I do?

Vet. It sounds like she has a blockage in her intestine, and that can get very nasty and expensive if not treated. The bowel can eventually die, and then you are looking at major surgery to cut out the dead part and sew the good pieces together.