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Household Pollutants and Dogs
A few sticky points

My pal Joplin is a canine lint trap. Dust and dirt and bits of fluff leap at her from sidewalk and sofa as though her cushy black coat were exerting an irresistible gravitational pull. I don’t mind a little dirt, myself, but Joplin does. She plops herself down to apply that prehensile pink paint roller tongue to all of her coat within reach, and then she licks her little doggy wrists and squeegees her face with them. I hate to see it. All this hygiene might have made sense in pre-industrial days, but dust just ain’t what it used to be.

Environmental health experts learned in the 1980s that house dust can be a significant source of exposure to hazardous pollutants such as lead and pesticides, especially for dogs, cats and human toddlers, mouthy denizens of the indoor dust zone.Now it turns out that relatively new toxic synthetic compounds widely used in consumer products are blowing around in your dust bunnies, too—among them, flame-retardants called polybrominated diphenyl ethers, or PBDEs, and stain, water and grease repellants called perfluorochemicals, or PFCs.

These latter chemicals, the PFCs, are better known by their trademarked names—Teflon® and Gore-Tex®, to name two. Flame-retardant PBDEs are more anonymous but equally ubiquitous in the household. They are commonly used in foam cushions, synthetic fabrics, and in the plastic housing of electric and electronic equipment such as coffeemakers and laptops. PBDEs can make up as much as 30 percent by weight of your stereo or television’s plastic housing, according to a 2005 article in the journal Environmental Science and Technology.

Both types of chemicals get into house dust in more or less the same ways. When the television or nonstick pan heats up, the compounds volatilize and then settle on surfaces, and as treated foam and fabrics degrade, flame-retardant and stain-repellant particles crumble into your dust. Not just into your dust but also into your dog, new research shows. Earlier this year, toxicologists at the Environmental Working Group, a Washington, D.C.– based nonprofit, collected blood samples from 20 pet dogs and 37 pet cats. The researchers pooled dog samples into one batch and cat samples into another and found high levels of PBDEs and PFCs in both.

What are the health effects of these indoor pollutants? “We’re really just starting to generate data,” says Linda Birnbaum, of the EPA’s Experimental Toxicology Division in Raleigh, N.C., and an expert in indoor exposures to PBDE. “But we know that flame-retardant PBDEs have been linked to developmental, reproductive and neurological defects in lab animals; poor immune function in marine mammals; thyroid and liver tumors in rodents; and low sperm counts and poor sperm quality in humans. One study found an association between high PBDE levels in women and undescended testicles in their sons.” For their part, stain and grease repellants—PFCs— have been shown to cause tumors at multiple sites in rats and mice and to damage their reproduction, growth and immune systems, Birnbaum says.

Only a few studies have focused specifically on the health impacts of synthetic chemicals on dogs. One shows a link between applications of the lawn herbicide 2,4-D and bladder cancer in Scotties and several associate formaldehyde emissions from carpeting with seizures and other disorders. But many environmental health and veterinary experts believe that chronic exposure to synthetic industrial pollutants in house dust may be at least partially responsible for skyrocketing cancer rates in dogs these days, and, Birnbaum believes, for the extraordinary rise in feline hyperthyroidism in the last 30 years. “The cat sits on that nice warm TV or sits on the sofa and grooms, grooms, grooms,” Birnbaum says.

Since World War II, the chemical industry has been churning out supremely useful, long-lasting, synthetic chemicals by the tens of thousands—as many as 80,000 compounds, most that could never occur naturally. Manufacturers have put billions of tons of them to use in myriad ways—preventing your mattress or sofa from bursting into flames when you fall asleep with a cigarette; keeping your coffeemaker, television, laptop and stereo from overheating and becoming fire hazards; helping your raincoat shed rain and your upholstery shrug off spills; providing lightweight, unbreakable jugs for your milk and squeezable tubes for your toothpaste; grease-proofing the liners of oily, bagged dog food, and keeping the kibble from turning rancid during the long months it may sit in that bag. The list is endless.

Only a very few of these chemicals are adequately tested for safety before being put into general use. Indeed, the free market system for judging new compounds seems to be “innocent until proven guilty.” Thirty years after they first went into use, PBDEs are finally receiving appropriate scrutiny. The European Union has phased out the use of two of the three commercial mixtures of PBDEs in new products, and limited use of the third formulation. Manufacturers in the U.S. have voluntarily stopped producing those two and use is being phased out nationwide as stocks are used up. Unfortunately, manufacture and use of a third PBDE mixture is still completely unregulated in all states except Washington and Maine. And because sofas and televisions aren’t something one replaces frequently, products containing PBDEs will be sitting around in our houses for many years to come.

The sad truth is that the typical American household is awash in synthetic industrial chemicals—as are you, and as is your dog. It’s enough to make you want to bury your head in the sand. But who knows what’s in sand these days? And pessimism won’t get us far. Better to roll up your sleeves and apply a little elbow grease to the problem.

There’s a lot you can do to reduce your household’s burden of indoor pollutants. As you replace furniture and rugs, choose new ones made of wool, hemp, cotton and other naturally more flame-resistant materials, and check manufacturers’ websites to find out whether these products have been made or treated with flame retardants and stain repellants. Frankly, this won’t always be easy, but it should become increasingly more so as the market for such products develops.

Ditto electronic equipment: Some manufacturers’ websites claim their products don’t use PBDEs; consider these when shopping for electronics.

Here are a few more tips.

•Don’t use pans with non-stick coatings. There’s still a lot of controversy about this, but old-fashioned cast iron is looking better and better.
•Grease-proof linings on dog food bags may be a significant dietary source of PFCs. Look for dog food bagged with untreated aluminum foil liners, if possible.
•Toss those plastic dog dishes, especially the water dish, and replace them with stainless steel.
•Don’t use pesticides, fungicides or herbicides, or use them only sparinglyand after all else has failed.
•Use nontoxic household cleansers and polishes.
•Look up the Maine and Washington state bills phasing out PBDEs and consider working to get similar legislation passed in your state.
•And here’s the depressing finale: vacuum, vacuum, vacuum. While you’re at it, experts recommend, dust once a week with a damp cloth. Less dust equals lower exposure for all household members, no matter how you cut it.

 

Because this isn’t just about our dogs and cats—it’s about all of us.

 

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This article first appeared in The Bark,
Issue 52: Jan/Feb 2009
Susan McGrath lives in Seattle and writes for Audubon, Smithsonian, National Geographic and other magazines.

Illustration by John Hersey

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