If you believe that your pet dog may have nibbled on a harmful holiday plant (or if your animal is acting sick and you do not know why), seek immediate veterinarian attention. Take pictures of the plant in question or bring an example with you to the veterinarian, Dr. Osborne states. If your animal ingests a toxic plant after-hours when your vet center is closed or if you’re really far from an emergency vet hospital, you can call an animal toxin control.