IIRC pyrethrin is more often the culprit. It's not the same as permethrin. Permethrin is found in PAM and the NIX/RID treatment people use for mites - though I don't use those on the snake either.
Permethrin has been the culprit in the puppies I have seen react...i was a dog groomer. It is very dangerous for dogs and reptiles alike, if not used correctly.
Molly & Steve
0.1 normal BP 'Precioucess'
0.1 BCI 'Luna'