I'm not certain how I should roll for this but here's what I'm going to try.
First transform to gain the scent ability then roll perception to determine anything about the shiver.
Then Craft (Alchemy) + Lab to test the shiver and work out whats in it.
(my sheet says 5 perception but its actually 8 I just didn't check the class skill box for it.)
Perception roll (1d20+8)
Craft(Alchemy) roll (1d20+12)