If your dog does get exposed to a toxic essential oil, there are a few tell-tale signs that can help you catch the issue quickly. Symptoms to look out for include: Drooling Laboured breathing Trouble walking Weakness Vomiting Irritation to the skin If you notice any of these signs on your dog, take them to a veterinarian immediately or call your local animal poison helpline. Be sure to turn off your diffuser and get your pet into some fresh air, too. To avoid any toxic effects on your dog, always keep any essential oil bottles out of reach and follow the appropriate steps for safe diffusion.