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and yet now i receive dense boxes of cat litter from amazon.

Seems to work for Chewy.com & Amazon.

This was an issue of bad timing, not a bad business model. People weren't really mentally at the point of buying such thing on-line, and pets.com burnt through their cash so quickly that it couldn't wait for people to start adopting it. As pointed out by others, Amazon made it work; however, they are very smart about diversifying, re-investing, and not being profligate with cash-on-hand.