Castile soap is a plant-based soap that is made from vegetable oils. It is popular for its ability to cleanse the skin and hair without removing natural oils. It has been used for centuries in many cultures, including those of Europe and Asia.
In addition to its use as a cleaning agent, castile soap can also be used as an insect repellent. The oil in castile soap acts as a natural insect repellent when applied directly to your skin or hair. Many people use castile soap in place of chemical-based bug sprays because it is safer for both humans and pets.
Castile soaps are often used by people who have sensitive skin or who prefer not to use chemicals on their bodies or pets’ fur, which makes it an attractive option when considering how best to kill fleas on your pet.
Fleas are bloodsucking parasites that live on warm-blooded animals. They burrow under the skin of their host animal and drink their blood until they are full before moving onto another host animal to repeat the process again until they die from old age or from being killed by their host animal’s immune system (if they live long enough).
While many products claim that they will keep fleas away from your dog or cat (and some do), nothing works quite as well as castile soap does. Castile soap kills fleas quickly and effectively, which means there are no more pesky bugs following around behind your furry friend.
How Does Castile Soap Kill Fleas?
Castile soap is a natural, plant-based soap that can kill fleas on contact. It is made from olive oil and water, and contains no chemicals or additives that might irritate your dog.
Castile soap works by dissolving the outer layer of a flea’s exoskeleton, which causes dehydration, or in extreme cases death. This process can take several days to complete, so you will not see immediate results. The best way to use castile soap is to put it on your dog’s coat and let it sit for about 15 minutes before rinsing off in the shower.
Difference Between Castile Soap and Regular Soap
Castile soap and regular soap are both made from the same ingredients: vegetable oils, water, and lye. The difference between the two types of soap is how they’re made. Castile soap is made through a process called saponification, which involves mixing sodium hydroxide with vegetable oil (usually olive oil or coconut oil). Regular soap is made by mixing lye with the fat from animals, such as tallow or palm oil.
The main difference between castile soap and regular soap is that castile soap does not contain any animal products. However, some people choose to use castile soap because they believe it’s better for their skin than regular soaps that contain animal fats.
Can I Wash My Dog and Cat With Castile Soap?
Castile soap is a great, natural alternative to harsh pet shampoos. It’s made using only vegetable-based ingredients and is gentle on your pets’ skin, so it’s safe to use on both dogs and cats.
The only thing you need to be careful of when washing your dog or cat with castile soap is that you don’t get it in their eyes. If that happens, rinse them thoroughly with water right away.
Castile soap will leave your pets’ coats shiny and clean without any harsh chemicals that can irritate their skin or damage their fur.
Homemade Castile Soap
The process to make castile soap is simple and easy, but it does require a bit of patience. First, you’ll need to gather your ingredients. You’ll need:
- -2 pounds of olive oil
- -1 pound of coconut oil
- -3 pounds of lye (sodium hydroxide)
- -12 ounces of distilled water
- -4 ounces of essential oils (optional)
If you don’t have essential oils, then you can skip this step. The soap will still smell like olive and coconut oils after it’s been made. Once you’ve gathered all of your ingredients, set them aside so they can cool down while you gather your equipment: a large pot; a thermometer; an old pan; a strainer; and cheesecloth.
Next, measure out 5 pounds of water into the pot and bring it to a boil on the stovetop over medium heat. While that heats up, measure out 3 pounds of lye into another container—this is going to get hot, so make sure that it’s big enough not to spill. When both are ready, carefully pour the lye into the pot of water and stir until dissolved (about 15 minutes). Once dissolved, allow your mixture to sit overnight or longer before pouring it into molds or bottles for storage in a cool, dark place like your pantry or basement where there isn’t any sunlight coming in through windows or skylights; otherwise, it may spoil prematurely due to exposure to light rays from these sources which can cause discoloration over time due to oxidation processes occurring within molecules present within ingredients like oils used within them.
List of Fleas Repellent Spray and Where to Buy
As a pet owner, you want to do everything you can to keep your pets safe and healthy. That includes making sure they don’t get fleas. The best way to keep your pet from getting fleas is by using a flea repellent spray. The following lists the top 10 best flea repellents on the market today along with their prices and where you can buy them.

Vet’s Best Flea and Tick Home Spray | Flea Treatment for Dogs and Home | Plant-Based Formula | 32 Ounces
Price : $9.97
Features :
- GENTLE PROTECTION: Vet’s Best Flea & Tick Home Spray uses certified natural ingredients to kill fleas, flea eggs, and ticks on contact.
- PROVEN EFFECTIVE: Whether facing an active infestation or are applying for routine prevention, our spray is scientifically proven effective against pests but gentle enough to use around the whole family.
- CERTIFIED NATURAL OILS: Each steam-distilled essential oil is selected for its potent pest-fighting properties and is 100% Certified Natural.
- TOTAL HOME DEFENSE: Applies easily on surfaces, indoors and out, including dog bedding, crates, furniture, blankets, upholstery, carpets, outdoor surfaces, and more. Also gentle enough to be applied directly on dogs and puppies 12 weeks or older.
- MADE IN THE USA: Our products are proudly manufactured in the USA with quality domestic and internationally sourced ingredients.
Additional Info :
Color | Green |
Item Dimensions | |
Height | 0.81 Inches |
Width | 3.38 Inches |
Length | 3.38 Inches |
Weight | 2 Pounds |

Whole Naturals EWG Verified & Certified Palm Oil Free, Castile Liquid Soap – 64 oz. – Unscented, Mild & Gentle Non-GMO & Vegan – Formulated with Carrier Organic Oils
Price : $24.99 ($0.39 / Fl Oz)
Features :
- EWG VERIFIED, USA MANUFACTURED & THE ONLY CERTIFIED PALM OIL FREE Castile Soap on Amazon. Our UNSCENTED castile is a mild formula free of essential oils and fragrance 2-3x more concentrated than regular soaps and cleansers. More soap per bottle means less waste in packaging.
- CERTIFIED ORGANIC. Our Nature’s Gold Castile is made with Organic plant-based ingredients. Sustainable ingredients & Supply Chain transparency. Our Castile Soap produces a luxurious lather without synthetic preservatives, thickeners, or foaming agents—which is good for the environment & great for your skin – only pure, fully-biodegradable plant oils transformed into soap.
- ORGANIC BLEND OF PRICKLY PEAR, ARGAN, JOJOBA, ALMOND & HEMP OILS. Our special formula contains luxury oils that are a source of vitamins, antioxidants and Omega fatty acids to create the ultimate hypoallergenic skincare solution leaving your skin smooth and hydrated, without clogging your pores. For dryness, eczema, psoriasis or acne-prone skin. It’s exactly what your skin needs to be feeding.
- NON GMO, CRUELTY FREE & VEGAN THIRD PARTY CERTIFIED. Whole Natural’s Liquid Soaps are 100% biodegradable & use all-natural, vegan ingredients that pose no threat to the environment. Our products & ingredients are never tested on animals & are cruelty-free.
- VERSATILE AND ECONOMICAL. Castile can be used to clean everything. Use it as a Household cleaning, shampoo, shaving foam, face wash, window cleaner, laundry detergent Baby wash, liquid floor cleaner, dish soap, or washing pets. Easy to dilute and still remain Effective. Each order comes with a FREE recipe E-book to create your own perfect formula. We are so confident that you’ll love using your Nature’s Gold Liquid Castile Soap from the moment it arrives, or we’ll refund every cent. Order Now.
Additional Info :
Item Dimensions | |
Weight | 4 Pounds |

FRONTLINE Plus for Cats and Kittens (1.5 pounds and over) Flea and Tick Treatment, 3 Doses
Price : $38.99
Features :
- Waterproof flea and tick treatment for cats and kittens: Frontline Plus for Cats provides waterproof, fast-acting, long-lasting flea and tick treatment and control for your cat. This product is approved for use on cats and kittens 1.5 lbs and over.
- Break the flea life cycle with frontline: Frontline flea and tick treatment for cats kills adult fleas plus flea eggs and larvae to stop existing infestations and prevent establishment of new infestations.
- Kills fleas and ticks: Frontline flea and tick treatment for cats kills fleas, flea eggs, lice, and ticks. This flea and tick treatment kills ticks, including those that may transmit Lyme disease.
- Trusted flea and tick protection for cats: Frontline Plus for Cats has been trusted by veterinarians for nearly 20 years. Made with 2 tough killing ingredients, fipronil and (S)-methoprene – one to kill adult fleas and ticks and the second to kill flea eggs and larvae – this fast-acting, long-lasting protection provides flea and tick control for cats and kittens 8 weeks and older.
- Lasting flea and tick protection: Frontline’s long-lasting formula is stored in the oil glands of the cat’s skin to give non-stop flea and tick protection for a full 30 days. Frontline flea and tick treatment for cats works non-stop for a full 30 days. A 3-dose supply lasts for 3 months.
Additional Info :
Color | Green |
Item Dimensions | |
Height | 0.5 Inches |
Width | 4.5 Inches |
Length | 6 Inches |
Weight | 0.07054792384 Pounds |

Rocco & Roxie Stain & Odor Eliminator for Strong Odor – Enzyme-Powered Pet Odor Eliminator for Home – Carpet Stain Remover for Cats and Dog Pee – Enzymatic Cat Urine Destroyer – Carpet Cleaner Spray
Price : $19.97 ($0.62 / Fl Oz)
Features :
- CERTIFIED GENTLE AND SAFE Chlorine free and color safe. Safe to use around pets and children. No hazardous propellants, no residue left behind. So gentle it’s been Certified Safe for all carpets, earning the Seal of Approval by the trusted Carpet and Rug Institute (CRI)
- ELIMINATES STAINS, ODORS AND RESIDUE If it’s gross, it’s gone. Not just the stain, but the stink. From stinky yellow pet urine and feces to vomit and other organic spills, our professional strength formula tackles them all.
- EVERY SURFACE, EVERY TIME For use on carpets, floors, furniture, clothing, litter boxes, kennels, carriers, all pet living and sleeping areas—anywhere stains happen.
- ENZYME ACTIVATED The key is getting to the problem deep-down. This spray contains natural enzymes that are activated on contact with odors and stains, feeding on ammonia crystals and organic matter until they are completely eliminated.
- 100% SATISFACTION GUARANTEED An Amazon best seller—for a reason. If your stains and odors aren’t gone, neither is your money. We’ll refund it in full.
Additional Info :
Item Dimensions | |
Height | 10 Inches |
Width | 2 Inches |
Length | 5 Inches |
Weight | 2 Pounds |

Beloved Pets Flea and Tick Control Treats for Dogs – Flea Prevention Soft Chews – Natural Tick Repellent Supplement – Made in USA Chewables – 140 Ct (Bacon)
Price : $26.91 ($0.09 / Gram)
Features :
- ✅ DAILY FLEA & TICK PROTECTION: flea & tick soft treats provides daily protection and control for your dog against fleas and ticks
- ✅ NATURAL & DELICIOUS & SAFE: the soft chews made with only natural and safe ingredients and it’s really tasty bacon flavor for dogs
- ✅ EASY TO USE: Just give some chews your dog daily to protect from fleas and ticks. RECOMMENDED SERVING PER DAY: up to 10 LB – 1 chew, 10-30 LB – 2 chews, 31-60 LB – 3 chews, 61-90 LB – 4 chews, 90+ LB – 5 chews
- ✅ ADVANCED FORMULA MADE BY USA VETS: the healthy formula contains hemp that has a complex healing effect on the body. NO GMO, cellulose, canola, corm, palm, soy
- ✅NO AGE LIMITS: the flea treats can be used for dogs of any age
Additional Info :
Item Dimensions | |
Weight | 0.625 Pounds |
In Conclusion
Castile soap is a natural, gentle soap made from vegetable oils. Because it is so mild and biodegradable, it can be used for many things around the house, including cleaning laundry, washing dishes and even bathing. But does castile soap kill fleas?
The answer is yes, but you should be careful how you use it. If you have an infestation of fleas in your home or pets, then you should use a more potent product that contains insecticides and insect growth regulators (IGRs) to kill the fleas on contact.
However, if you have just a few flea bites or see one or two fleas on your cat or dog, then using castile soap as a shampoo will kill them. The reason why castile soap kills fleas is because the soap suffocates them when they come into contact with it.
When using this method to kill fleas on animals or people, make sure that all parts of their body are covered in the shampoo and let sit for five minutes before rinsing off thoroughly with water.