Common Toxic Plants
Found below is a list of some of the most common plants deemed toxic to dogs and cats. Thankfully, most of the plants mentioned are bitter tasting or are otherwise unappealing such that most pets would avoid consuming the amounts needed to cause a poisoning. That said, avoidance is likely the safest route.
Please be aware that this is not a comprehensive list. Please refer to the following American Society for the Prevention of Cruelity to Animals website for a thorough list: http://www.aspca.org/pet-care/poison-control/plants/