According to the Environmental Protection Association (EPA), typical household cleaning products and air fresheners are one of the leading contributors to poor indoor air quality. The agency reports that poor indoor air quality can lead to health issues; animals have faster metabolisms and smaller lungs than humans, and not only are they processing these chemicals at a faster rate, they are also breathing them in more rapidly. Because animals are closer to the ground, they are more often in direct contact with these harmful substances.
Now, I'm not about to recommend any cleaning supplies, as the above was actually something a "green" cleaning product company sent to me as part of a press release. But, the information is worth noting that there are so many things in our environment that we don't consider for either ourselves, or our pets. It is worth doing a little research before using products around you and your pets to make sure it is safe.