Some smells that dogs hate are: Citrus - Many dogs dislike the smell of citrus fruits, such as oranges, lemons, and grapefruits. You can use citrus-scented sprays or candles to deter dogs from certain areas or objects. Vinegar - The strong odor of vinegar can be off-putting to dogs. You can use a vinegar and water solution to clean floors or furniture that you want to keep your dog away from. Alcohol - Dogs may find the smell of alcohol unpleasant or even intoxicating. It's important to keep alcoholic beverages out of reach of dogs, as they can be toxic if ingested. Some essential oils - While essential oils can be used to soothe or calm dogs, some oils, such as tea tree oil or eucalyptus oil, can be toxic to dogs if ingested. In general, it's best to consult with a veterinarian before using any essential oils around your dog. Ammonia - The strong smell of ammonia can be irritating to dogs' noses and respiratory systems.