ESO Alliance Breton Terrier is a pet you can unlock by collecting 10 Breton Terrier Mammoth Bones and using them to make a runebox. The fragments can come from Pelinal’s Boon Boxes during Whitestrake’s Mayhem, so you’ll need to take part in the event’s PvP activities before you can put the little dog in your Collections menu.
Getting ten bones is the time-consuming part. Once you’ve collected them, there’s no crafting station or quest hand-in to worry about. You use one bone in your inventory, open the resulting runebox and claim the pet. One detail worth knowing before you do that: the dog’s alliance colours depend on which character combines the fragments.
How to unlock the ESO Alliance Breton Terrier pet
You need 10 Breton Terrier Mammoth Bones for one Alliance Breton Terrier runebox. The game’s official support instructions give the following steps:
- Earn Pelinal’s Boon Boxes by completing eligible activities during Whitestrake’s Mayhem.
- Open the boxes and collect 10 Breton Terrier Mammoth Bones. The bones are rare, so you won’t find one in every box.
- Switch to a character from the alliance whose Terrier you want before combining your fragments.
- In your inventory, right-click one Mammoth Bones fragment and choose Use. On console, open the item’s action menu and select the equivalent option.
- The fragments combine into Runebox: Alliance Breton Terrier. Use the runebox to add the pet to your Collections.
- Open Collections and find the unlocked non-combat pet to summon it.
There’s no need to craft anything at a workbench. Don’t stop after the bones disappear, either: the newly created runebox must still be opened to unlock the ESO Alliance Breton Terrier.
Where to find Mammoth Bones for the ESO Alliance Breton Terrier
To collect ESO Alliance Breton Terrier fragments, open Pelinal’s Boon Boxes. ESO’s event support says a box can have a small chance of dropping one or two fragments. The developer hasn’t released an exact percentage, and there isn’t a special box that guarantees enough bones for the pet.
These are the eligible PvP quest sources the game’s event instructions have listed:
- Battlegrounds: qualifying daily quests from Battlemaster Rivyn.
- Cyrodiil boards: Scouting, Battle, Warfront and Conquest missions.
- Cyrodiil towns: quests in Vlastarus, Bruma, Cropsford, Cheydinhal and Chorrol.
- Elder Scroll objectives: eligible capture and recapture quests.
- Imperial City: district daily quests.
- Rewards for the Worthy: open the PvP reward mail you receive for additional event boxes.
The November 2026 Mayhem runs from 12 November at 15:00 GMT to 23 November at 15:00 GMT. The rewards are tied to the live event, so you can’t farm fresh Pelinal boxes from these activities all year round.
Can you get all three ESO Alliance Breton Terrier colours?
Yes, but each version needs its own set of 10 bones. The Alliance Breton Terrier wears the colours of the alliance belonging to the character who combines the fragments. That gives you three versions: Covenant, Dominion and Pact. You don’t choose the colour from a menu after making the runebox.
If you want all three ESO Alliance Breton Terrier variants, plan for 30 Mammoth Bones in total. Combine ten on an appropriate character for each alliance. Make sure you’re on the right character before pressing Use, as the runebox is created for that alliance’s version.
The unlock is a cosmetic pet, not a mount or combat companion. Once you’ve opened its runebox, you can find that version in Collections. Combining ten bones doesn’t automatically unlock the other two Alliance Breton Terrier variants.
Is there a faster way to farm ten bones?
There’s no confirmed drop-rate boost for choosing a particular campaign, time of day or quest giver. The best way to collect ESO Alliance Breton Terrier fragments is to complete the activities you can finish consistently and open the reward boxes they provide.
If you prefer shorter fights, Battlegrounds dailies are worth considering. In Cyrodiil, town and board quests give you other options. Imperial City can be rewarding too, although you’ll need to watch for hostile players while working on district tasks. Choosing a route you enjoy makes the grind less painful, especially when the fragments aren’t dropping.
Don’t forget Rewards for the Worthy mail. Those containers can come alongside your PvP progress, and it’s easy to overlook them if you’re only watching your bag after a quest turn-in. You may also be collecting War Torte recipe pieces or outfit styles while farming the same boxes.
What if you have ten bones but no pet?
If your ESO Alliance Breton Terrier hasn’t appeared, check the item count and the runebox. Confirm that the pieces in your inventory are Breton Terrier Mammoth Bones, then use one. If you’ve already combined them, look for Runebox: Alliance Breton Terrier rather than trying to use another bone.
Open the runebox itself, then check Collections. A runebox sitting in your bags is not the same as the pet being unlocked. If the game won’t let you use it, read the item description and check whether you’ve already collected that alliance version before doing anything with the remaining fragments.
Related ESO guides
Official source: ESO Support: How to get the Alliance Breton Terrier pets.
