Poley: how to get the pet in WoW Forever
Poley is a companion pet from Classic that returns in World of Warcraft: Forever. 
Polar Bear Collar still summons it the way it did in Classic, according to the tooltip on the beta.
In short
| Item | Polar Bear Collar |
| Source | Quest: Redeem iCoke Prize Voucher |
| New in Forever | no, from Classic |
| Account-wide | yes, according to Wowhead |
How to get it
It is the reward of the quest Redeem iCoke Prize Voucher, from level 1, for both factions.
What changed since Classic
Wowhead’s database marks the pet as account-wide: learned once, it would be there for every character. Blizzard has not confirmed that itself.
More pets from the same source
Every pet of WoW Forever, with where it comes from, is in the pet guide.
Frequently asked questions
How do you get Poley in WoW Forever?
It is the reward of the quest Redeem iCoke Prize Voucher, from level 1, for both factions.
Is Poley new in WoW Forever?
No. Poley was already in Classic and returns in WoW Forever.
Sources: Wowhead