I had a quick look in CK and here's what I'm guessing will work:
- Create a
Magic Effect for your disease (Have a look at Rockjoint aka DisDamageOnehandedTwohanded).
- Create two separate spells (one for the wolf, the other for the werewolf) that use the magic effect you just created.
- Add
Conditions for the magic effect in both spells. The
Condition Function should be
GetRandomPercent. Set
Comparison to <= and value to whatever you want.
- Go to
Character->
Race and search for wolf.
- Open up the race(s) you are interested in and go to the
Attack Data tab.
- Select an attack you want to have apply the disease.
- Find your new disease spell in the
Attack Spell drop-down box.
- Click OK to exit the
Race window.
- Repeat the previous 4 steps for the other race.