Hello dejbond007,
If your dog has eaten your cd key, you're pretty much stuck, UNLESS you have proof of purchase. A receipt, for example. Maybe a photograph of the CD and the damaged box could work too, but proof of purchase is favorable.
If you do have it, then email VSTEP. You can tell your story and offer the proof of purchase. Their email is info@shipsim.com
If you proof you have a legal copy, they can issue a new license key. If you cannot proof it, then I guess it's just bad luck for you. But VSTEP is of course not responsible for your dog's behaviour.
Regards,
Fred