I know that sounds stupid, but we just got this report from a neighbor on NextDoor.com:
One of our neighbors was walking her dog near the dry creek bridge in Ironwood Park when the dog picked up a small package. After dropping the package the dog began drooling excessively and then behaving bizarrely. The vet believes the dog got hold of a METH package. The dog is expected to survive after days of intensive care.
Always worth inspecting what your dog picks up, even if s/he drops it!