As a general rule, cats are sensitive when it comes to smells, but there are a few scents they hate that might just surprise you. They can't stand citrus and as much as you might love the smell of fresh herbs, cats hate rosemary and thyme. Banana and mustard are a big no-no too, as well as lavender and eucalyptus.
Orange and lemon peels (cats dislike citrus smells), cayenne pepper, coffee grounds, pipe tobacco, lavender oil, lemon grass oil, citronella oil, peppermint oil, eucalyptus oil, & mustard oil.
Humane deterrents are the best approach.... Smells that repel cats: To keep cats out of yards or gardens, plant the herb rue or sprinkle dried rue. Citrus or lemon scents (orange peels, lemon peels), garlic, ammonia, vinegar, coffee grinds, pipe tobacco, mustard, citronella, or eucalyptus all deter cats as well.
Vinegar as a cat repellent
Spraying Outdoors – Straight or diluted vinegar can be sprayed around the edges of a garden, and on plants, fences, posts and garden décor to keep cats away. Concentrate the spray on areas that the cats frequent or that you particularly want to protect.
Lavender, geranium, and eucalyptus
Some gardeners use lavender plants to deter deer, but you can also try this as a deterrent for felines. Likewise, geranium and eucalyptus plants give off an odor that cats dislike.
Peppermint oil is highly toxic to cats.
Without the enzymes required to break down phenols, cats exposed to peppermint oil can experience: Liver damage. Breathing difficulties. Wobbliness and seizures.
Toxicity to pets
Small ingestions of a few leaves or low concentration eucalyptus oil leads to mild gastrointestinal distress, but ingestion of highly concentrated eucalyptus oil has been associated with severe signs including seizure, tremor, and, rarely, acute renal injury.
Keeping Fleas and Ticks Away
To make your own flea and tick repellent, mix one part vinegar with one part water and spray it on your pet's fur. You can also add a few drops of vinegar to your pet's drinking water to help repel fleas and ticks from the inside out.
Quick Solutions: Scatter fresh orange and lemon peels or spray with citrus scented fragrances. Coffee grounds, vinegar, pipe tobacco, oil of lavender, lemongrass, citronella or eucalyptus also deter cats. Plant the herb rue to repel cats, or sprinkle dried rue over the garden.
A liquid herbal supplement can consist of lemon juice, orange juice, cranberry juice, and rosemary extract mixed with a bit of water. This is an excellent cat deterrent. Another liquid fusion can be made by mixing the juice from a green orange and strong coffee. This has proven to be a great cat deterrent.
Cats, being fairly territorial, are unlikely to feel comfortable doing their business in a place that smells like another, much larger, feline already frequents it. Put down extra strength hot chilli powder. It annoys cats' paws and whiskers without causing them serious harm. They'll stay well away.
Cats dislike the smell of certain scents, such as citrus, eucalyptus, lavender, peppermint, and rosemary. You can use these scents to deter cats from entering certain areas of your home or garden by using essential oils, planting these plants, or using citrus peels.
Cats are more sensitive to scents than humans, so essential oils with strong odors, such as citrus and lavender, can help repel them. You can substitute lime, peppermint, and/or eucalyptus for the lemon, wild orange, and lavender if you prefer.
Sprinkling Epsom Salt As A Deterrent
You can also make a pet deterrent by sprinkling some Epson salt around your garden and around every plant. When you plant seeds, sprinkle some salt in a row and reapply every two weeks.
Do cats like the vinegar smell? While I love using vinegar for cleaning, cats do not like vinegar. While the scent of vinegar is not a problem for them physically, they just don't like it. Because of that, vinegar can serve as a natural deterrent if there's an area you'd like your cats to avoid.
Soak a sponge, cloth, or rag in vinegar and place it in areas where you don't want your cats. This method works for both outdoor and indoor purposes. You can keep the rag in a small container to prevent the vinegar from drying up so quickly.
Cats dislike apple cider vinegar (ACV) because of its smell. If ingested in undiluted form, some cats may have diarrhea and vomiting. A non-diluted version of ACV can be abrasive to a kitten's tender skin. Some cats may have allergies to ACV, which may lead to itching and rashes.
While it is not deadly, lavender is toxic for cats. Lavender contains linalool and linalyl acetate, which cats cannot process in their livers. This means that consuming too much lavender can lead to liver damage.
All citrus fruits (grapefruit, oranges, limes and lemons) are mildly toxic to cats. Consider every part of the fruit, from the seeds to the fruit and skin, to be toxic for your feline. The substances found in lemons (Citrus limon) is toxic to your cat, even though you and your family can safely ingest lemons.
Many essential oils, such as eucalyptus oil, tea tree oil, cinnamon, citrus, peppermint, pine, wintergreen, and ylang ylang are straight up toxic to pets.
Cinnamon contains coumarin, a naturally occurring compound that's medically used as a blood thinner. "A large dose could conceivably cause problems for your cat with clotting," Eldredge says. She adds that cats may also get a reaction in their mouths when they ingest cinnamon, such as redness and irritation.
Toxic consumption:
Intoxication is most often seen when 100% tea tree oil is used. As little as 7-8 drops (10-20 mL) applied to the skin may be fatal to both cats and dogs. Products with low concentrations (e.g. shampoos, body washes) are generally not considered toxic.