This isn't the only one that has this issue with the pet. The Anniversary skin they fixed in the latest patch, the pet seems to bounce between the "default" appearance and the incorrect skin that was on the weavers before the update.
My guess is you'll have to wait, but /bug it regardless and they'll probably get around to it Soon (tm).
[center][color=#CC3300]Lieutenant Sersi Niflhel[/color] [color=#666699]· [i]Retired[/i][/color]
[color=#993333]"I will give you no quarter, and I will take none."[/color][/center]