Greenery

• A common indoor plant, aloe, is poisonous to pets when ingested. Symptoms of aloe ingestion are 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, as are hibiscus, birds of paradise, oleander and rhododendron. Rhododendron and oleander are especially dangerous and can cause death.
  
  

Fruit Plants

• Apple trees, including crabapples, feature poisonous parts causing dilated pupils, respiratory problems and shock. Consuming apricot tree stems, leaves and seeds produces the same effects, as apricot and apple tree parts contain cyanide. Citrus trees, such as lemon and grapefruit, can harm pets if parts are consumed. Avocado plant ingestion for dogs and cats produces vomiting and diarrhea. Fig trees, also known as ficus trees, as well as tomato plants also have toxic chemicals affecting cats and dogs. Ingestion of tomato plants causes pets to over-salivate and have dilated pupils, slowed heart rate, diarrhea and depression.
  
  

Other Hazards

• Tree tobacco causes vomiting, paralysis and even death if pets eat parts of the plant. The Texas umbrella tree has toxic berries, and other parts of the tree are hazardous. St. John's wort harms cats and dogs that brush against them, causing dermatitis. The herb thyme causes vomiting and diarrhea. Onions give pets a bad stomachache and break down the red blood cells of your pet if consumed. While they have no known toxicity to cats, macadamia nuts cause vomiting, tremors and weakness, particularly in the back legs, in dogs.