A garden can be a beautiful retreat, but for dog owners, it can also harbor hidden dangers. Many common plants are highly toxic to dogs and can cause serious health problems if ingested. Below is a list of some of the most poisonous plants that might be growing in your garden, and tips on how to protect your furry friend. --- 1. Oleander (Nerium oleander) One of the most toxic plants for dogs, oleander contains cardiac glycosides, which can cause severe heart problems. Symptoms of ingestion...