I highly doubt it. (Except the upcoming I am Legend, starring Will Smith, but even he has a dog)
Undoubtedly, your companion(s) will be extremely important during a zombie invasion or a zombie siege. You're gonna need someone to pass the time with, watch your back, and blow off your head if you get bitten.
If you can't find any of the above, any average joe will do. As long as he can run, shoot, dodge, bash, loot, scavenge, salvage, stab, joke, laugh and play intellectual games.
Start finding some friends that you can hole up with during the zombie invasion before its too late.