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Oak
Pigweed
Ponderosa pine needs
Prince's plume
Sweetclover - if it has become spoiled and moldy
Yew
Ask your vet if there are additional poisonous plants in your area.

Symptoms of Poisoning
Abdominal pain
Blindness
Bloat
Collapse
Constipation
Diarrhea
Drooling
Excitement
Irregular heartbeat or breathing
Muscle tremors