Is there something special you have to do to get the glade pet? I got to the end of the month yesterday and picked a pet (I thought) but noticed later that it didn't show up. Since this is the second time I thought I'd ask...
Glade creature were often adopted a while back and thus don't always appear on the first page of your creatures without clan, did you check if it was on a different page?
If you did click on 'adopt', the Glade should have closed and the creature received somewhere in your creatures without clan.
~ ♫ ~ Thème Artiste | Saloon & International moderator