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.
It’s not so much the pepper itself that’s the problem, it’s the chemical in the peppers that make it spicy. Capsaicin irritates a dog’s delicate nose.
These are good repellents to use in the garden because your canine will avoid them and therefore won’t damage any flowers or plants.
Dogs hate the smell of mustard oil, so it’s also a good repellent to use. The strong scent is so powerful to dogs that they won’t come near it.