I SO hate Petland and am so sorry to hear your Casey passed away - that's so sad and you have my condolences...
Here's a site that you can post on also - we just revived it and it's solely for these kind of awful stories and you're more than welcome to post Casey's story there - the more it's talked about the more people will become aware of these awful Pet Stores and where the dogs they sell come from
http://www.millbusters.com/forums/index.php
Today, a good good friend of mine is having to put her dog Pepper to sleep...so I'm having a hard time posting today. He's a pet store puppy too & very sick ....they love him too much to let him suffer ....you can read about him on Millbusters also.
you have my deepest sympathies....3 years old is far too young.