There are many toxins that can cause seizures in dogs, however, once a dog recovers from the seizures and eliminates the toxin from their body they do not have on-going seizures.  Heavy metals such as lead, zinc, mercury and aluminum are some exceptions because exposure usually occurs slowly over a long period of time or from a dog swallowing an object made of the metal. Puppies are particularly prone to toxicity from metals since they are apt to put everything in their mouth.  

Although lead is no longer used in paint and other products there may be enough of the old products in your dog's environment to be a hazard.  Lead can be found in copper water pipes, linoleum, caulking material, drapery weights, and golf balls, in addition to lead based paint.  

Probably the most common toxins to cause seizures in dogs are insecticides.  Many of these kill insects by interfering with the central nervous system and they can do the same to dogs if not used properly.  Another cause of seizures in dogs is exposure to toxins from spoiled food in the garbage. 

The following is a list of some of the common toxins that may cause seizures in dogs:

Bee and wasp venom

Toad Toxicity - This condition occurs in animals that bite or mouth various species of toads that contain bufotoxins.  Toxic species include the Colorado River toad and the marine toad.

Alcohols and glycols (ethylene glycol, methanol)

Camphor

Phenols

Pine oils

Solvents (toluene, benzene, xyelne)

Lead

Zinc

Aluminum

Mercury

Amanita mushrooms

Penitrems A (moldy cheese, walnuts)

Boric Acid

Bromethalin

Chlorinated hydrocarbons

Fluroacetate

Metaldehyde

Organophosphates and carbamates

Pyrethrins and pyrethroids

Rotenone

Strychnine

Vacor

Zinc phosphide

Akee

Anticholinergics (angels' trumpet, deadly nightshade, jimson weed, jasmine, lantana)

Blue-green and red algae

Bleeding heart and Dutchman's breeches

Chinaberry

Moonseed

Tobacco

Water hemlock

Yellow Jasmine