What to do if my dog has a swollen abdomen?

What can be the cause if Sometimes at night, before I go to bed, I shake badly, and I feel tight gripping around my abdomen and back muscles. I always have a dream about a dog in a sewer and I wake up screaming?

• Answer:

  It sounds like tremors. A tremor is an involuntary, somewhat rhythmic, muscle contraction and relaxation involving to-and-fro movements of one or more body parts. It is the most common of all involuntary movements.