So, in a nutshell, no. Perhaps a lengthy response. It all depends on how it enters your body. Sharpies are created for children (at least, they were in the initial draft), and they are non-toxic. That means they should not be harmful to any animal, including dogs.
The primary component of most deodorants is aluminum stearate. This is a soap that comes from petroleum or natural vegetable oils. Soap has a strong alkaline effect on the body, while aluminum has an acid effect. When you spray some deodorant on yourself, the aluminum particles react with the acid compounds in your skin to form a protective layer that keeps other acids and chemicals from entering your body.
Aluminum is a metal that can cause serious health problems if it enters your body through your mouth, lungs, or gut. Because Sharpies are not meant for adults, they do not contain any warnings about them being toxic to dogs or other animals. However, just like any other product, if it gets into your dog's eyes, nose, or mouth he could end up suffering from irritation or even blindness.
Dogs can smell things that humans cannot. Humans have three million different types of receptors in their noses, while dogs have only about half as many.
The highlighter component is non-hazardous. The plastic is producing a possible blockage, which is a source of concern.
Highly reactive chemicals can be hazardous to humans as well as to animals. For example, benzene is an ordinary chemical that is used in many products including paint and gasoline. But it is also known as a human carcinogen. Another dangerous substance called dichloroethane has been used as a soil fumigant but is now banned because it's harmful to humans and animals. It's very reactive and can release chlorine atoms when it reacts with water, causing serious health problems for people and animals near where it is used.
Anybody who uses any type of marking pen should wear protective clothing, use caution not to get any ink on their hands, and wash their hands after finishing work. High-reactive substances such as those found in markers can cause serious harm if they are absorbed through the skin or ingested. Some types of pens contain alcohol solvents that can cause skin irritations and respiratory problems if inhaled. Long-term exposure to these substances may cause cancer.
People who work with markers on a regular basis may want to seek out safer alternatives. There are waxes that can be used instead of markers, for example.
According to Dr. Justine Lee, the Associate Director of Veterinary Services at Pet Poison Helpline and a board-certified emergency critical care veterinary expert. "In general, if the product is dry," she notes, "it poses minimal hazard when pets are exposed to veterinary professionals using these items." That means that if you follow all safety instructions and don't apply the polish too quickly, then your dog should be fine.
However, if the polish contains acetone or other chemicals known to be toxic to dogs, then this would be an indication for which you should seek immediate medical attention. Even if your dog appears to be okay after being exposed to nail polish, it's important to get them to a vet immediately in case they are suffering from exposure symptoms such as diarrhea, vomiting, difficulty breathing, etc. These people can help determine if your dog has been exposed to any dangerous substances and take the necessary steps to ensure their health.
As with anything else that you would put in your dog's mouth, be sure to read labels carefully and follow directions completely. Never use products that contain warnings to keep out of reach of children and animals. If in doubt, leave it out for now.
If swallowed, rust is not poisonous. However, I'd be concerned about the rough surface cutting or causing abrasions on the dog's tongue, which might lead to infection. Rusted surfaces are permeable and can be a breeding ground for microorganisms. Unless you have reason to believe that your dog has ingested rusty material, I would recommend cleaning his mouth out with a soft brush daily until you see how he reacts.
Also, keep in mind that even if a dog doesn't eat the rust, he may still be exposed to it through contact with other objects that contain it. For example, if a dog walks through a field of rusty nails, he could be injured by them.
Lastly, don't try to remove rust from metal objects using soap and water. It won't work and you'll just end up with a dirty mess that requires further cleaning. Use a steel wool pad or some other non-abrasive material instead.
Does your dog play with rusty objects? If so, you should clean his teeth regularly so no one gets a hold of any bacteria. Also, make sure that none of the metal fragments get into his mouth because even though they aren't toxic, they can cause serious problems if they're eaten.
Finally, keep an eye out for any signs of pain or injury.