You choose DIPLOMACY > TALK. You're not sure if a WILD BEAST is able to understand what you say, but you will still attempt talking to it.
You go up to the beast and give it a friendly greeting.
It responds with a friendly howl greeting.
...Ok, maybe friendly is not a good way to describe it.
Hostile would be more fitting.
The beast gnashes its claws at and strikes at you!
You manage to dodge just in the nick of time!
FRIENDLY DEFINITELY ISN'T THE APPROPRIATE WORD HERE.
The beast doesn't trust you enough to listen to your "greetings". Not that it can understand you in the first place.
It looks somewhat scared.
Nino: Kindness is key. Pet the doggy.
You'd try, but it won't let you get close enough to pet it!
tl;dr: Nino tries speaking, and Ghost-wolf technically responds, but not in a good way. Ghost-wolf attacks, but it's dodged. Nino suddenly has the universal human instinct of petting any dangerous animal they come across, but Ghost-wolf doesn't trust him enough to let him.