• Your best friend may get sick after tasting some common plants.dog image by Ramona smiers from Fotolia.com
  
  When your pup is playing out in the yard, the last thing you may think is that your colorful tulips may be harmful to him. The reality is that dozens of plants are poisonous to dogs. Dog owners need to worry most about a handful of culprits in common gardens.
  
  

Sago Palm

• Sago palm is a common garden plant also known as coontie palm, cardboard palm, cycad and zamia. It is toxic to dogs, cats and horses, Ingestion of sago palm can cause vomiting, bloody stools, jaundice, increased thirst, bruising, blood coagulation problems, sudden vomiting with bloody diarrhea, liver damage, liver failure and death.
  
  

Tulips

• Tulips may beautiful, but they can be harmful to dogs.red open tulip amid multi-colored tulips image by Jorge Moro from Fotolia.com
  
  Tulips are poisonous for dogs, cats and horses. Vomiting, depression, diarrhea and hypersalivation are signs that your dog may have ingested the toxins tulipalin A and B. Be especially mindful of tulip bulbs, which store the greatest concentration of toxins.
  
  

Oleander

• Oleander can be deadly for dogs.Oleander - Crete image by Kerry from Fotolia.com
  
  Oleander, which thrives throughout the United States, is toxic to dogs, cats and horses. Fallen branches or other plant debris are highly toxic and can be the source of a dog's poisoning. Cardiac glycoside is the poison in oleander that can cause colic, diarrhea, sweating, loss of coordination, shallow or difficulty breathing, muscle tremors and possible death from cardiac arrest.
  
  

Azalea

• There are 250 species of azaleas.Azalea image by Denis Morgun from Fotolia.com
  
  Azaleas, rhododendrons and rosebays are poisonous to dogs, cats and horses. The 250 species of azaleas are found throughout the nation. Grayatoxin, found in these plants, may cause vomiting, diarrhea, hypersalivation, weakness, coma, hypotension, depression, cardiovascular collapse and death. Animals begin to exhibit signs of poisoning within a few hours of ingestion. After a couple days of symptoms, dogs may improve or lapse into a coma and die.