These are what I consider the "top" adoption sites where you can get a pet!
listed in no particular order
The Mousepad mice, elephants, bears, etc.
~Angel's Our Happy Home angels, faeries, merbabes, etc.
Billy Bear's Playhouse purp beans, hedgehogs, etc.
Ladyhipoo's adoptions fairies, unicorns, hippos, etc.
Meg's Place net nerds
Amanda's Castle page guardians
Fox Den foxes
Melissa's Page raccoons, bitty raccoons
The Net Banshee fairies, aliens, banshees, etc.
Pooh's Corner teddy bears, angel bears
You'll also be able to find SEVERAL Links to other places here
Megangirl's cyberpet adoption links
Don't forget to check out CyberPet Netiquette