Apparently Ganz has an event that takes place every wednesday at the eStore. It is called "Webkinz Wednesday" and it looks like exclusive pets and items will only be sold on this day.
This also explains the appearance and disappearance of the Webkinz Grey Wolf. Ganz explains the confusion in this letter:
"Hello,
Thank you for your inquiry.
The Grey Wolf is currently scheduled to be sold every "Webkinz Wednesday". Please note, however, that the schedule is subject to change without prior notice.
Please visit the site often for updates on the availability of the Grey Wolf and all other online exclusive items and pets.
Thank you,
Webkinz eStore Support"

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