From 2006 to 2011, four veterinary clinics reported that human workers suffered ill effects, ranging from pain and respiratory difficulty to headaches and nausea, after inhaling highly toxic phosphine fumes from the vomitus of dogs who ingested zinc phosphide rodenticide pellets, according the CDC. Veterinarians and owners can also be exposed to the toxic gas when treating horses for phosphine poisoning, according to the AVMA.

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