Dog #891 Funko Pop from The Walking Dead is being vaulted/discontinued. Distributors have recently stopped taking orders for this Pop meaning the current supply on the market will be all that is manufactured.
There are a total of 5 Funko Pops from this Walking Dead release and this is the second one vaulted. See all 5 below:
Judith Grimes #887 - VAULTED
Daryl Dixon #889
Dog #891 - VAULTED
There are plenty more vaulted TWD Funko Pops that can be searched in the database at the bottom of this post.