Citrus: The strong scent of citrus fruits like lemons, oranges, and grapefruits is highly aversive to dogs. Many dog repellents use citrus as a deterrent.
Vinegar: The sharp, pungent smell of vinegar is unpleasant to dogs. It’s often used in cleaning products that double as pet deterrents.
Chili Peppers: The spicy, intense smell of chili peppers, including jalapeños and cayenne, is something dogs find overwhelming and irritating.
Ammonia: The strong, harsh odor of ammonia is not only disliked by dogs but can also be harmful if inhaled in large quantities.
Rubbing Alcohol: The smell of rubbing alcohol is too strong for dogs’ sensitive noses, making it a smell they typically avoid.
Perfume and Cologne: Many dogs find the strong, artificial scents of perfumes and colognes unpleasant
Nail Polish Remover: The strong chemical smell of acetone, found in nail polish remover, is highly offensive to dogs.
Mothballs: The strong, chemical scent of mothballs is not only unpleasant for dogs but can also be toxic if ingested.