Megan,
You should be able to simply output a DXF file from Allegro via the File > Export > DXF.. menu. It requires a mapping file which maps the Allegro Class / Subclass over to the AutoCAD DXF Layers. (I believe it is available on all levels of the tool but I am not sure)
Display the layers you are looking to include in the DXF file (Makes the conversion file easier to maintain)
Open the DXF Out form (File > Export > DXF..)
Enter a name in the layer conversion file field and click on Edit. (This will bring up a GUI to perform the layer mapping)
After you make you mapping selection click on OK.
Update the Output Units and Accuracy then enter a DXF Output file name.
Click Export
After it outputs you could open up a new session of Allegro and import the DXF File you created to see if it contains what you are looking for.
Hope this helps,
Mike Catrambone