So, the PCs just fought a werewolf. The Summoner's Eidolon, the Ranger and the Ranger's animal companion were all bitten.
We had a table discussion of whether the Summoner could get Lycanthopy from this. We decided it was probably possible by RAW and seemed more cool and thematic as well.
It doesn't appear that it could infect the animal companion in any way. It's a curse and only affects humanoids/sapients or something like that. Not animals anyway.
Both characters don't know they failed the save (one was a crit fail actually). Based on the Ranger crit succeeding at a survival check I allowed them to find one dose worth of wolfsbane but they will need to travel to find more or get to a large enough town to purchase it.
So, now we get to wolfsbane. It seems clear that the RAW cure is to survive stage 3 of wolfsbane poison. That brings us to what appears to be an unclear topic: Can a PC choose to fail a saving throw? Both characters Fort saves make it reasonably possible that they could make the first save and just not be affected, or save enough afterwards to not make it to stage 3 of the poison before the max duration expires. In either case they would not meet the criterion of surviving stage 3. If they can just choose to fail it's actually easier.