I reckon it can. I reckon the original is severally undertracked, and whilst never reaching a million, was pretty darn close. The sequel will likely do it because:
1. It will be going to a larger customer base
2. DS owners LOVE dogs- look at Nntendogs
3. It will likely be advertised better to sell to this market
4. The lower price point means more people may end up taking the punt
5. With a lack of good DS games, this may be the DS' last Hurrah, in that sense it may have Nintendo backing which makes it all but a certainty.
So, what do you think? For reference, it's at around 80,000 in Japan after 1 week.