5 common plants that are poisonous to dogs and cats:

We don’t know for sure why pets have a tendency to eat plants, but experts believe that, like toddlers, dogs and cats may just want to explore their environment with their mouths. You can pet-proof your backyard by using temporary barriers like chicken wire to keep puppies and kittens from potentially dangerous plants during their teething stage.

If you suspect your pet has ingested anything poisonous, immediately contact your local veterinarian or the ASPCA Animal Poison Control Center at 888-426-4435. For a list of toxic plants, visit aspca.org.

Also known as: hortensia, hills of snow, seven bark
Toxic to: dogs and cats
Signs: diarrhea and vomiting

Also known as: day lily, Easter lily
Toxic to: cats
Cause: unknown
Signs: decreased activity, loss of appetite and kidney failure
Did you know? Vets treat more cats for poisoning by lilies than by any other source, according to a Pets Best Insurance Services survey.

Sago Palm:
Also known as: coontie palm, cycad, zamia
Toxic to: dogs and cats
Cause: cycasin
Signs: vomiting, bloody stool and liver failure

Also known as: narcissus, jonquil, paper white
Toxic to: dogs and cats
Cause: alkaloids
Signs: vomiting and low blood pressure; convulsions and tremors from ingesting large amounts

Also known as: cordatum, heartleaf philodendron
Toxic to: dogs and cats
Cause: calcium oxalate crystals
Signs: intense burning and irritation of the mouth, excessive drooling

Source: Tina Wismer, DVM, medical director at the ASPCA Animal Poison Control Centerause: cyanogenic glycoside