To make it more confusing, different parts of a plant can be the culprit. Some plants, like the yew, have poisonous properties in all parts, while others may have only poisonous leaves, berries, fruits, or roots. Many pets instinctively know when to stay away from poisonous plants, but behavior varies according to age and type of animal. Dogs and cats approach eating differently, and puppies can be particularly susceptible to poisoning. He adds that breeds like retrievers are especially at risk because they instinctively put things in their mouths.
Plants pose a problem to both kittens and adult cats, since felines tend to be lifetime nibblers.
Pet owners really need to be aware of potentially hazardous plants throughout the year. In spring, some popular outdoor plants to beware of include azaleas, rhododendrons, nandinas, hollies, and yews. Stargazer, Asian, and tiger lilies are just as dangerous to cats as Easter lilies. Other spring blooms, including tulips, hyacinths, and alliums can also be harmful, and the bulb is the most toxic part of the plant. In summer, common plants such as hydrangea, clematis, and English ivy can be problematical.