To dream of your stomach or abdomen represents your level of sensitivity. It symbolizes how well you can "stomach" or accept something. How vulnerable you are to having your feelings hurt or allowing something to upset you.
To dream of a perfect stomach or perfect abs represents a carefree attitude. It may also point to insensitivity. Negatively, it may reflect emotional conflict with an issue that embarrasses you or outsmarts you.
If your stomach or abdomen is attacked, injured, or sick in a dream it's pointing a sensitive issue or problems with acceptance.
To dream of having a dog attack your stomach may reflect your heightened sensitivity about issues you feel other people aren't listening to you about. It may also reflect how you are ignoring your own safety or well-being to keep yourself from failing or getting behind in life. The dream may be a sign that you need to seek expert advice. Alternatively, the dream may represent something else's continued vicious personal attacks on issues that make you very sensitive. Fear that something is wrong with you.
Example: A woman had recurring dreams of a vicious dog attacking her stomach. In waking life she felt her family and work life was more important that checking a doctors check up she suspected she needed. When she finally did get a check up she was diagnosed with stomach cancer and died three months later.