Those plants that usually kill are only harmful when digested by the animal. Puppies are most vulnerable as their immune system is far from established and many puppies love to chew on anything available.
Many common holiday plants brought into the home are harmful. When these plants are digested the most visible common symptoms are vomiting, loss of appetite, and lethargy. If you ever witness your pet exhibiting any such symptoms, even though you cannot trace it to a specific plant or event, it is highly recommended that you visit with a veterinarian immediately. If left untreated, kidney failure can ensue. Poisoning caused by plants is an emergency, you could induce vomiting and give milk or wash mouth with water. However, be very careful whenever you are inducing your pet to vomit. Make sure you understand what type of plant that he ate first before making him do so.
The following are some very common plants that are considered dangerous. If you see them digest any of these, you must make them vomit right away:
Lilly of the valley, monkshood, oleander
Crown of thorns
You know your pet better than anyone, so if you see that Fido is not being himself, please make a note and if things worsen you need to take action. Lethargy is the one that I usually put on top of the list, if he is not responsive; then, I assume something is really wrong. If he seems happy, tail wagging’ and hungry, but a little off, I do not usually run to the vet, rather I choose not to feed that day and always supply plenty of chicken broth and watch him carefully as many events usually pass and you should not to get overly anxious.