Many poisonous plants for dogs are very common in backyards. These toxic time-bombs range from being only mildly toxic (for example, causing vomiting) to being responsible for more serious canine health problems or even death!
If you wish to err on the safe side, thoroughly research any vegetation, berries, etc. to which your canine friend has access.
In the case of some plants that pose a danger, only a particular part of the plant in question will be toxic (that is, the seed, leaves, etc.). But it is beyond the scope of this article to delve into those details.
Such questions should be addressed to toxicologists.