I play Petz 5, and make my own breeds with LNZPro and Petz Workshop. I made an Alaskan Malamute and when you adopt one, his default name is Steele!
Yes there is a 'Petz 6,' it is known as Petz 2006. And from what I've heard, it is supposed to be terrible.
You can adopt multiple kittenz/puppiez but you can only have one out at a time. They never grow up and you cannot breed them.
They are no longer made of fuzzy balls attached with lines. They are way creepier now. They are like Frankenstein's monster - very lifelike, but not quite.
The main objective of the game is to teach your pet tricks and compete with other dead-eyed puppies to even get the basics your pet will need. There are very few accesories or toys, and you have to buy them now.
And look what they did. They butchered Petz.com and made it into an ultra-cute website. You could download patches and many other goodies before, but now they do not even mention the previous Petz games.
They claim that there is 'no such thing as too cute.' Well, in this case, there is.
Click below to see what used to be Petz.com
http://petz.uk.ubi.com/
(Oh well, at least the Rabbidz thing was kinda funny 8D).