This is like the Bubonic Plague

Okay so almost all of my wolves are being infected with Influenza, and I literally cannot keep up nor do I have the money to heal all of them. Can illnesses vanish over time, or do I have to heal all of them? Like I'm a little lost on what I can do.

You need to make a seperate cave and get the sick ones quarantined there. Currently all your wolves are in ‘Unsorted’, so they’re just going to keep infecting each other.

First of all quarantine. Put sick wolves in one cave and the healthy in another. No unsorted ones at all.

Influenza will not heal on its own. Heal them one by one and don't forget to move them.

Ohhh, I didn't realize putting them in a cave like that would stop spread, I thought it was just for pure organization purposes. Thank you both!

That's why I'm using the power of fleas to fight infections.