Toxic fumes may come from substances like insecticides, tear gas, and smoke from fires where certain plastics and other materials are burned. These types of fumes irritate and inflame a dog’s airways, making it hard to breathe or eliciting specific reactions to airborne poisons.
Whenever a dog breathes toxic fumes, assume that the airways will be inflamed. Most inhaled poisons will cause difficulty breathing. Some may also cause salivation and twitching, among other signs of toxicity, including vomiting and collapse.
It is critical you act quickly. However, you should:
Instead, move the dog to an area away from poisonous fumes without endangering yourself, then follow these guidelines:
Bleaches, detergents, and disinfectants are the most likely household chemicals to cause a problem. Therefore, keep pets away from these chemicals by securing them before, during, and after cleaning time. Pool/spa chemicals are also commonly implicated in inhalation poisonings. Keep these products safely contained during regular pool/spa maintenance.
When building a fire, be aware of the materials used and keep dogs out of enclosed areas that may fill with smoke. In rural areas, be aware of insecticide use and spraying schedules. Lastly, make sure equipment that produces carbon monoxide is regularly serviced.

This list of dangerous toxins is important beyond words. I feel every new pet owner should have everyone in the house review these and know that they can call the Poison Helpline for help. They should keep the number handy- on the fridge, in everyone's cell phone etc.
Thanks for providing this information. Our furry four-legged friends are part of our family and we want to do whatever is possible to keep them safe.