ghost hunter states.
Your hunting pet is imbued with spirit energy. It gains potency when tracking or fighting the supernatural, and gains an arcane ability: ghost-form, mind-link, or arrow-swift. Take this ability again to choose an additional arcane ability for your pet.
"Your hunting pet" seems to be a prerequisite to this special ability. But, it also seems that the asset A trained hunting pet:
Your animal companion obeys your commands and anticipates your actions. Cohort (Expert: Hunter).
is exclusive to Hounds. So, is this special ability uniquely exclusive to the Hound Playbook, or can other playbooks pick up trained pets?