Warning for your animal's health:
http://www.snopes.com/critters/crusader/swiffer.aspI recently had a neighbor who had to have their 5-year old German Shepherd dog put down due to liver failure. The dog was completely healthy until a few weeks ago, so they had a necropsy done to see what the cause was.
The liver levels were unbelievable, as if the dog had ingested poison of some kind. The dog is kept inside, and when he's outside, someone's with him, so the idea of him getting into something unknown was hard to believe. My neighbor started going through all the items in the house. When he got to the Swiffer Wetjet, he noticed, in very tiny print, a warning which stated may be harmful to small children and animals." He called the company to ask what the contents of the cleaning agent are and was astounded to find out that anitfreeze is one of the ingredients. (actually he was told it's a compound which is one molecule away from anitfreeze). Therefore, just by the dog walking on the floor cleaned with the solution, then licking it's own paws, and the dog eating from its dishes which were kept on the kitchen floor cleaned with this product, it ingested enough of the solution to destroy its liver.
Soon after his dog's death, his housekeepers' two cats also died of liver failure They both used the Swiffer Wetjet for quick cleanups on their floors. Necropsies weren't done on the cats, so they couldn't file a lawsuit, but he asked that we spread the word to as many people as possible so they don't lose their animals.
So far this is what we have found.
Although ETHYLENE glycol is commonly used in antifreeze and deicing solutions and has been identified as posing a danger to pets, the compound listed in the WetJet MSDS, propylene glycol, is a distinctly different substance. Propylene glycol is also sometimes used in antifreeze solutions, but it is much safer than ethylene glycol — it has been classified by the Food and Drug Administration (FDA) as an additive that is "generally recognized as safe" for use in food, it is found in a variety of medicines and cosmetics, and it is recommended as a safe alternative to antifreeze for pet owners. Propylene glycol is also an ingredient used in many, many different brands and types of household cleaning products, so if it truly posed a significant risk of causing fatal liver damage in cats and dogs, we should be hearing about many more pet deaths associated with cleaning products other than the Swiffer WetJet.
According to one source "Animals that ingest antifreeze and don't get treatment die from KIDNEY damage!"
To read more on this subject click on the words "Swiffer Wetjet Hoax" above.
UPDATE:Althought it turns out that the Swiffer Wetjet email is a hoax. It appears that a dog that eats grapes or raisins can die. Please read the following link:
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http://www.aspca.org/site/PageServer?pagename=grapes Update:Veterinary toxicologists at the ASPCA Animal Poison Control Center have reviewed the claim described in a widely distributed email alleging a relationship between the use of Swiffer Wet Jet and liver failure in a dog
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http://www.aspca.org/site/News2?page=NewsArticle&id=16054&security=2220&news_iv_ctrl=1400 
