Many plants harm both cats and dogs.

Many plants harm both cats and dogs.
People often times have plants in gardens or indoors without considering the toxicity to pets. 

Greenery
Aloe, is poisonous to pets when ingested. Can cause vomiting, diarrhea, loss of appetite, tremors and a change in urine color. Holly plants also harm pets when eaten, causing vomiting, diarrhea and depression. Yew bush parts may give pets trouble if eaten. Various types of ivy, including English and Boston ivy, and mistletoe, are toxic to dogs and cats. The ingestion of boxwood bush parts causes vomiting and diarrhea in dogs and cats. Hostas cause similar reactions in pets when eaten. Elephant ear plants, caladium and several ferns also harm pets when eaten.

Flowers
Lilies, irises and chrysanthemum flowers are hazardous for pets. Poinsettia plants cause irritation, including vomiting, in to cats and dogs when eaten. Tulips, particularly the bulbs, cause vomiting, diarrhea and salivation. Daisies and chamomile are other flowering plants toxic to pets, hibiscus, birds of paradise, oleander and rhododendron. Rhododendron and oleander are especially dangerous and can cause death.

Debbie Pokorn
Fitpetsandpeople.com