I always thought this would be a suprisingly good fit:
Particulary the part at 0:19 which sorta sounds like dog barking to me, the GBA Ware games had those kind of sounds in some of the microgames, so I thought that a speed up short version would make a good bg microgame theme.
Other than that there is also the Wario Land 4 soundtrack which actually had songs and voice clips borrowed for Mega Micro Game$:
http://warioforums.com/index.php?threads/wario-land-references-in-the-warioware-series.36/
Particulary the part at 0:19 which sorta sounds like dog barking to me, the GBA Ware games had those kind of sounds in some of the microgames, so I thought that a speed up short version would make a good bg microgame theme.
Other than that there is also the Wario Land 4 soundtrack which actually had songs and voice clips borrowed for Mega Micro Game$:
http://warioforums.com/index.php?threads/wario-land-references-in-the-warioware-series.36/