Dogs (also known as Companions) are helpful allies that attack zombies. They can be found next to flares and, once encountered, will follow the player for a short amount of time. An equipped companion can also be used with the companion perk. This equipped companion will follow you for the entire run. On all modes if you have the companion perk equipped you may find dogs you have already bought during the run and they will follow you for a short time, you may only find 3 dogs per run meaning you can have 4 dogs in one run.
List of Dogs
Weapon Pack Exclusive Dogs