This sounds like it is an umbilical hernia that happens sometimes in dogs. If its small and not causing her any issues then you can just have the vet take care of it when she is spayed.
If she is alreasy spayed its just something to discuss next time you see the vet so he can note it on her chart.
You can read about hernis in dogs and cats here
http://www.thepetprofessor.com/secArticles/dog/Hernias_in_dogs_and_cats.asp
Hope this helps you!
Edited by NHolmes on July 28 2005 at 11:56am
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