What's this game - space shooter with dog or cat character

[rsoandrew]

My MAME machine died and in rebuilding it, I only put in ROMs that I knew the kids and I played. According to my kids I forgot one of their favorite games, which they can't name.

The kids and I looked through all the snaps I have (pretty complete) trying to find the game but couldn’t .

Here is how they describe it (5 and 7 years old).

It is a space shooter similar to Galaga except that it is two players and each player gets to choose if they want to be a dog or a cat.

Any ideas?

Thanks,
Andrew