Dogs’ sense of smell is 10,000 to 100,000 times better than humans. In a dog’s nose, the air for breathing takes a different route than the air for smelling. Dogs can even smell while exhaling.
The human sense of taste is largely dependent upon smell. In dogs, this is not true. In fact, they have a relatively weak sense of taste–which explains some of the nastier things dogs will eat. It makes me laugh when a dog food company runs a commercial to assure me that dogs will love the taste of their product. My dog basically inhales his food.
Many unlikely materials are considered hazardous, for example White Out (Thank Heaven that we’ve progressed to computers from typewriters!).
Heavy metals, such as lead, silver, and especially mercury are hazardous. If you go to the mirror and open your mouth, you are likely to see amalgam (metal) fillings in your teeth. These are about 50 percent mercury, along with silver, tin and copper.
If your hobby is making or repairing stained glass windows, you fill the space between the individual pieces of glass with lead. Does this mean you need to have experts ensure your hobby room is decontaminated before you sell your house?