Top Ten toxins to pets:

DOGS:
  1 Chocolate
  2 Insect bait stations
  3 Rodenticides (i.e., mouse and rat poison)
  4 Fertilizers
  5 Xylitol-containing products (i.e., sugar-free gums and candies)
  6 Ibuprofen (Advil® or Motrin® in brand name or generic form)
  7 Acetaminophen (Tylenol in brand name or generic form)
  8 Silica gel packs
  9 Amphetamines, such as ADD/ADHD drugs
 10 Household cleaners

CATS:
  1 Lilies
  2 Canine permethrin insecticides (topical flea and tick medicine designed for dogs but
     erroneously placed on cats)
  3 Household cleaners
  4 Rodenticides
  5 Paints and varnishes
  6 Veterinary non-steroidal anti-inflammatory medications (Rimadyl®, Deramaxx®)
  7 Glow sticks/glow jewelry
  8 Amphetamines (such as ADD/ADHD drugs)
  9 Acetaminophen (Tylenol® in brand name or generic form)
10 Ibuprofen (Advil or Motrin®  in brand name or generic form)

courtesy petpoisonhelpline.com