with Dogz you can breed them, they grow up, etc.
Nintendogs has a little more advanced technology but not as many features.
I've played the PC game petz for as long as I've had a computer, around 10 years now. I still play Dogz 5 on occasion. It's fun breeding them!
EDIT: I take that back the gameboy game you MIGHT NOT be able to breed like in the PC version. Hmm. I can give you the link to a thread on a Petz site with more information if you'd like.
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