Citrus fruits like lemons, oranges, and grapefruit can cause irritation in their respiratory tract. So it’s best to avoid these scents in your home for your dog’s safety.
The strong, acidic smell of vinegar is too strong for a dog’s sensitive nose. Luckily, it isn’t toxic to dogs so it’s still safe to use around the house.
Dogs hate the smell and taste of spicy peppers like chili peppers, jalapeno, and cayenne powder. It’s not so much the pepper itself that’s the problem, it’s the chemical in the peppers that make it spicy.
Dogs hate the smell of fragrant spices like garlic, ground mustard, and paprika. These are good repellents to use in the garden because your canine will avoid them and therefore won’t damage any flowers or plants.
Mothballs have a very distinct smell and it’s one of the smells dogs don’t like. Once again, it’s the chemical in moth repellents that keeps dogs away.