11 Ingredients That Shouldn’t Be in Your Dog’s Shampoo

iHeartDogs is reader-supported. Some of the links below may be paid affiliate links, where we receive a small commission on a product at no additional cost to you. 

Discover the key to a healthier, happier pup through our guide on dog shampoo ingredients. Every pet parent wants the best for their dog, but with the overwhelming array of grooming products available and the wide use of chemical ingredients in use, making the right choice can be a challenge. Learn about the common yet potentially harmful ingredients lurking in dog shampoos, such as Sodium Lauryl Sulfate (SLS), Parabens, and Phthalates, and why they might be detrimental to your dog’s health. Also learn about natural, skin-friendly alternatives like Coconut Oil derivatives and essential oils that promote a healthy coat without compromising safety.

Whether you’re bathing a puppy or a senior dog, understanding these key components helps ensure that bath time is not only enjoyable but also beneficial for your dog’s skin and overall well-being. Embrace a holistic approach to dog care, and embark on a journey to find the perfect, health-promoting shampoo for your dog.

At a Glance: Dog Shampoo Ingredients to Avoid

Here’s a quick list of the “bad” ingredients in dog shampoo you’ll want to avoid. Read on to learn more about these harmful effects of these common dog shampoo ingredients.

• Artificial Fragrances: Can cause irritation and allergic reactions.
• Artificial Colors: Unnecessary and can cause skin irritation.
• Parabens (Methylparaben, Propylparaben, etc.): Used as preservatives, but can disrupt hormone function.
• Formaldehyde: A preservative that can be toxic and cause allergic reactions.
• Isopropyl Alcohol (Rubbing Alcohol): Can be drying and irritating to a dog’s skin.
• Mineral Oil: A petroleum by-product that can clog pores and hinder skin breathing.
• Phthalates: Used to dissolve other ingredients, but can be harmful to the liver and kidneys.
• Propylene Glycol: Used as a moisturizer but can be harmful in large quantities.
• Sodium Laureth Sulfate (SLES) / Sodium Lauryl Sulfate (SLS): Creates lather but can cause skin irritation and allergies.
• Cocamide-MEA/Cocamide-DEA: Foaming agents that can cause allergic reactions.
• Diethanolamine (DEA): Used to create a creamy texture, but can be harmful to the liver and kidneys.
• Triethanolamine (TEA): Adjusts pH but can cause skin and eye irritation.
• Polyethylene Glycol (PEG): Helps with absorption but can be irritating to the skin.

Learn More About Dog Shampoo Ingredients to Avoid

#1 – Surfactants

Surfactants are active compounds widely used in dog shampoo ingredients to serve multiple purposes, including acting as emulsifiers, detergents, wetting agents, and foaming agents. Their primary function is to lower the surface tension between two substances, such as oil and water, making it easier to remove dirt and oils from the dog’s skin and fur.

Common Harmful Surfactants

• Sodium Lauryl Sulfate (SLS) and Sodium Laureth Sulfate (SLES): These are perhaps the most well-known and commonly used surfactants in cosmetic and personal care products. They’re known for their strong cleaning power and ability to create lather. However, SLS and SLES can strip away natural oils from the skin and fur, leading to dryness, irritation, and potential allergic reactions. The harshness of these chemicals can also damage the skin barrier, making it easier for carcinogens and other harmful substances to penetrate the skin.
• Ammonium Lauryl Sulfate (ALS) and Ammonium Laureth Sulfate (ALES): Similar to SLS and SLES, these ammonium-based surfactants are effective cleansers and foaming agents. However, they share the same drawbacks, including the potential to irritate the skin and fur, disrupt the natural skin barrier, and allow for the penetration of harmful substances.

Safe Alternatives

• Sodium Cocoyl Isethionate: This is a gentle surfactant derived from coconut oil. It is known for its mild properties, making it suitable for sensitive skin. It effectively cleanses without stripping away natural oils, thus maintaining the skin’s moisture balance.
• Decyl Glucoside: Another coconut-derived surfactant, Decyl Glucoside is known for its gentleness and low potential for skin irritation. It is biodegradable and environmentally friendly, making it a safe choice for pet parents who are also conscious about the environmental impact of their products.
• Lauryl Glucoside: A plant-derived surfactant known for its skin-friendly properties. Lauryl Glucoside is made from coconut oil and glucose, and it effectively cleans without irritating the skin. It’s biodegradable and eco-friendly, making it an excellent choice for dog shampoos focused on natural ingredients. This surfactant is suitable for dogs with sensitive skin due to its mild and non-toxic nature. Skout’s Honor focuses on safe formulas and includes this gentle surfactant in their Probiotic Lavender Pet Shampoo & Conditioner to give your pup a good clean that protects against environmental damage and inflammation. 

#2 – Parabens and Preservatives

Preservatives in dog shampoos extend shelf life and prevent the growth of bacteria, mold, and yeast. However, certain commonly used preservatives can pose health risks to dogs.

Common Harmful Preservatives

• Parabens (Methylparaben, Propylparaben, etc.): Widely used in cosmetics and personal care products, parabens are effective preservatives. However, they are known to mimic estrogen in the body and may disrupt hormone functions, potentially leading to cancer and tumors. They can also cause skin irritation and allergies.
• BHA/BHT (Butylated Hydroxyanisole and Butylated Hydroxytoluene): These synthetic antioxidants are used to prevent rancidity in oils and fats but are suspected to be endocrine disruptors and carcinogens. They may also cause liver and kidney damage.
• DMDM Hydantoin: A preservative that releases formaldehyde, a known carcinogen. It can cause allergic reactions, skin irritation, and is harmful to the immune system.
• Phenoxyethanol: Used as a preservative in many cosmetics, phenoxyethanol can cause skin irritation and might be toxic to the liver and nervous system.
• TEA (Triethanolamine): Often used to adjust pH, TEA can cause skin and eye irritation and is suspected to be a carcinogen. It may also react with other ingredients to form cancer-causing nitrosamines.

RELATED: Canine Cancer – What You Can Do To Protect Your Dog

Safe Alternatives

• Rosemary Essential Oil: Not only does it have natural preservative properties, but it is also beneficial for the skin and fur, providing a soothing effect.
• Gluconolactone: Derived from corn, gluconolactone is a polyhydroxy acid (PHA) that offers preservative effects. It is gentle and antioxidant-rich, making it suitable for sensitive skin.
• Glyceryl Caprylate: Derived from coco, palm, and glycerin, this compound is effective in combating yeast, bacteria, and mold, making it a safe preservative alternative. It’s also known for its moisturizing properties.

#3 – Moisturizers

Moisturizers in dog shampoos are essential for maintaining the hydration of the skin and fur. While many moisturizers are beneficial, some commonly used dog shampoo ingredients can be detrimental to a dog’s skin health.

Common Harmful Moisturizers

• Mineral Oil: A by-product of petroleum processing, mineral oil creates a barrier on the skin and fur. While it might seem to lock in moisture, it actually coats the skin like plastic, clogging pores and interfering with the skin’s natural ability to release toxins and breathe.
• Dimethicone: A type of silicone used for its smoothing and lubricating properties. However, like mineral oil, it forms a barrier on the skin and fur that can trap dirt, sweat, bacteria, and sebum, potentially leading to skin irritation and exacerbating skin conditions.
• Petrolatum: Often used for its barrier-forming and moisturizing properties, petrolatum can also clog pores and slow down skin function and cell development. It may also contain impurities linked to cancer.
• Paraffin: A waxy substance derived from petroleum, coal, or oil shale. While it’s a common ingredient in various skin care products, it can clog pores and prevent the skin from breathing, which may lead to irritation and slow down the natural regenerative processes of the skin.

Safe Alternatives

• Cocoa Butter: A natural fat extracted from the cocoa bean, cocoa butter is rich in fatty acids and hydrates the skin deeply. It’s also known for its healing properties and can improve the health and appearance of a dog’s skin and fur.
• Coconut Oil: Known for its moisturizing and antibacterial properties, coconut oil nourishes the skin and fur without clogging pores, promoting healthy skin and a shiny coat. Options like Burt’s Bees Natural Hydrating Shampoo With Coconut Oil provide a natural infusion of moisture to sooth dry dog coats.
• Sunflower Oil: High in vitamins A, D, and E, sunflower oil is an excellent moisturizer that helps to maintain the skin’s natural barrier and reduces transepidermal water loss.
• Avocado Oil: Rich in vitamins A, D, and E as well as omega-3 fatty acids, avocado oil is highly penetrating and imparts beneficial nutrients to the skin, supporting healthy skin and fur.
• Passion Fruit Oil: Also known as maracuja oil, it is lightweight and rich in vitamins and minerals, making it an excellent moisturizer for maintaining a healthy coat.
• Castor Oil: Known for its humectant properties, castor oil helps in retaining moisture by preventing water loss through the outer layer of the skin.

#4 – Artificial Fragrances

Fragrances are often added to dog shampoo ingredients to make them more appealing to pet parents. But not all fragrances are safe. Some can have adverse effects on a dog’s health.

Common Harmful Fragrances

• Synthetic Parfum (Fragrance): The term “fragrance” or “parfum” on an ingredient label can refer to a mixture of various chemical scent compounds. These synthetic fragrances are concerning because they can contain harmful chemicals not listed individually on the label. They can cause allergies, dermatitis, and respiratory problems in both pets and humans. Additionally, some of these chemicals are suspected endocrine disruptors and can negatively impact the liver and reproductive organs.
• Phthalates: Often used in conjunction with synthetic fragrances, phthalates help scents last longer. Problem is, they’re known to be endocrine disruptors and have been linked to liver and kidney damage, as well as reproductive issues. The hidden danger of phthalates is that they are rarely listed explicitly on ingredient labels, often lurking under the general term “fragrance.”

Safe Alternatives

• Essential Oils: Natural essential oils can provide a pleasant scent without the risks associated with synthetic fragrances. However, it’s important to use them judiciously, as some essential oils can be harmful to dogs if used improperly or in excessive amounts. Oils like lavender, chamomile, and rosemary are generally safe and can offer additional therapeutic benefits.
• Natural Fragrance Oils: These are fragrances that are derived from natural sources through methods like distillation, expression, or extraction. Unlike synthetic fragrances, natural fragrance oils maintain the natural integrity of the scent compounds without the addition of synthetic chemicals. They are a safer option for adding fragrance to dog shampoos and are less likely to cause adverse reactions. But, as always, take care in using any new products with your dog.

#5 – Anti-Bacterial Agents

Anti-bacterial agents are often added to dog shampoos to eliminate bacteria and prevent odor. However, certain anti-bacterial chemicals can be harmful to dogs.

Common Harmful Anti-Bacterial Agent

• Triclosan: This is a widely used anti-bacterial and anti-fungal agent found in various consumer products, including dog shampoos. Triclosan is known for its effective bacterial killing properties, but it has come under scrutiny for its potential health risks. Studies have shown triclosan can disrupt endocrine functions, particularly thyroid hormones, which are critical for normal growth and development. It’s also been linked to reproductive malfunctions and skin irritation. Due to these concerns, triclosan has been phased out in certain products, but it may still be present in some dog shampoos.

Safe Alternatives

• Acapulco Extract: Derived from the leaves of the Acapulco plant, this natural extract has been traditionally used for its anti-bacterial and anti-fungal properties. It’s a safe and effective alternative that not only combats bacteria but also promotes healthier skin.
• Sugarcane Alcohol: Ethanol derived from sugarcane is a natural disinfectant that can effectively eliminate bacteria without the harmful side effects of triclosan. It’s gentle on the skin and a safer choice for anti-bacterial purposes in dog shampoos.
• Chitosan: This is a natural polysaccharide obtained from the shells of crustaceans like shrimp and crabs. Chitosan has anti-bacterial properties and is biodegradable, making it a safe and eco-friendly alternative. It’s also known for its ability to promote wound healing and improve skin health.

#6 – Colorants

Colorants are added to dog shampoos primarily for aesthetic reasons, to make the product visually appealing. Not all colorants are safe, though, and some can pose health risks to dogs.

Common Harmful Colorants

• Lake Dyes and FD&C Colors: These synthetic colorants are derived from coal tar and petroleum. They are widely used in various consumer products, including cosmetics and personal care items. Recent awareness has raised concerns about their safety, as they are considered potential neurotoxins and have been linked to cancer. In addition to their potential carcinogenic properties, these artificial colors can cause allergic reactions and skin irritations in both dogs and humans.
• Carmine: Although a natural colorant derived from crushed cochineal insects, carmine is another colorant to avoid. It’s commonly used in cosmetics and food products for its red pigment. However, carmine can cause allergic reactions in some dogs and people. Additionally, the ethical concerns regarding its production from insects make it a less desirable choice for many pet owners.

Safe Alternatives

• Mineral Oxides: These are natural inorganic compounds used for coloring and are considered safe for use in dog shampoos. Mineral oxides, such as iron oxide (for red, brown, and yellow colors) and titanium dioxide (for white), provide a range of colors without the risks associated with synthetic dyes or natural colorants like carmine. They are non-toxic, hypoallergenic, and environmentally friendly, making them an excellent choice for coloring dog shampoos.

#7 – Emulsifiers

Emulsifiers in dog shampoos are ingredients that help blend water with oils and fats, creating a consistent and stable mixture. They are key in forming the creamy textures and bubbles that make shampoos effective and enjoyable to use. However, some commonly used emulsifiers can be harmful.

Common Harmful Emulsifiers

• Diethanolamine (DEA): DEA is used in many cosmetic and personal care products for its emulsifying properties. It helps create a rich lather and creamy texture. However, DEA has been a subject of concern due to its potential health risks. Studies have shown that DEA can disrupt hormonal balance, particularly affecting the function of the endocrine system. It has also been linked to an increased risk of liver and kidney cancers. DEA can react with other ingredients in a product to form nitrosamines, which are known carcinogens.
• Cocamide Monoethanolamine (MEA): Similar to Cocamide DEA, Cocamide MEA is used for its foaming properties and also to thicken the product. Like DEA, MEA can also react with other chemicals to form potentially harmful substances.

Safe Alternatives

• Stearyl Alcohol: This is a fatty alcohol derived from vegetables, commonly used as an emulsifier in cosmetic products. It is gentle on the skin and helps to create a smooth, creamy texture in shampoos. Stearyl alcohol is non-irritating and non-toxic, making it a safe alternative to DEA.
• Cetyl Alcohol: Another vegetable-derived fatty alcohol, cetyl alcohol acts as an emollient, emulsifier, and thickening agent in dog shampoos. It is well-tolerated by most skin types and does not pose the hormonal or carcinogenic risks associated with DEA. Cetyl alcohol contributes to the creaminess and lather of the shampoo without compromising the pet’s health.

Dr. Cuddles Pawfect Gloss™ Bubble Pet Shampoo is a vet-formulated and pH-balanced shampoo for dogs and cats that offers soothing properties, courtesy of ingredients like hemp oil and yuzu extract. A blend of shea butter, aloe vera, and vitamin E nourishes sensitive skin. It’s bubbly creamy texture delivers a satisfying clean without any harmful ingredients.

#8 – Solvents

Solvents in dog shampoos are used to dissolve other ingredients and help them combine into a stable solution. They play a role in the effectiveness and consistency of the shampoo.

Common Harmful Solvent

• Propylene Glycol: This is a synthetic solvent widely used in many products, including dog shampoos, treats, and various human foods. Its primary function is to act as a humectant, ensuring that products retain moisture. Despite its widespread use, propylene glycol can be harmful. It is the main ingredient in certain types of anti-freeze, which raises concerns about its safety. Studies have shown that propylene glycol can cause damage to the liver and kidneys with prolonged or high-level exposure. It can also lead to skin irritation and allergic reactions in some dogs.

Safe Alternatives

• Vegetable Glycerin: Derived from plant oils like soy, coconut, or palm, vegetable glycerin is a natural and safe alternative to propylene glycol. It acts as a humectant, solvent, and emollient, providing moisture and enhancing the skin’s hydration. Vegetable glycerin is non-toxic, gentle, and suitable for dogs with sensitive skin.
• Water: The most natural and safest solvent, water is essential in dog shampoos for effectively blending and diluting ingredients. It does not pose any health risks and is excellent for ensuring the shampoo’s consistency and ease of application.

#9 – Bug Repellent Additive

Bug repellent additives in dog shampoo ingredients lists are used to ward off pests like fleas, ticks, and mosquitoes. While effective, some common chemical additives can be harmful to dogs.

RELATED: 8 Best Insect Repellent for Dogs

Common Harmful Bug Repellent

• DEET (N,N-Diethyl-meta-toluamide): DEET is a widely used ingredient in many bug repellent products for both humans and pets. It is known for its effectiveness in repelling a wide range of pests. However, DEET can be dangerous for dogs. Prolonged or excessive exposure to DEET has been linked to neurological issues, skin irritation, and even more severe problems like degenerative and congenital diseases. The risks are particularly pronounced in dogs due to their habit of licking their fur, which can lead to ingestion of the chemical.

Safe Alternatives

• Citronella: This is a natural oil extracted from the leaves and stems of different species of lemongrass. Citronella is known for its natural insect-repellent properties. It’s safe for dogs and provides a pleasant, refreshing scent.
• Lemongrass Essential Oil: Similar to citronella, lemongrass essential oil is effective in repelling bugs and is safe for use in dog shampoos. It should be used in diluted form to ensure it does not irritate the dog’s skin.
• Lavender Essential Oil: Known for its soothing properties, lavender oil also has natural insect-repelling qualities. It’s gentle on the skin and helps in calming anxious dogs, besides providing protection against bugs.
• Rosemary Essential Oil: Rosemary oil is another natural option that can repel insects. Richard’s Organics Flea and Tick Shampoo for Dogs blends rosemary with other essential oils to create a natural dog shampoo that kills and repels fleas and ticks.

#10 – Formaldehyde

Formaldehyde is a preservative and disinfectant found in some dog shampoos. It’s used to prevent the growth of bacteria and prolong shelf life. Its use raises significant health concerns.

Common Harmful Effects of Formaldehyde

• Carcinogenic Properties: Formaldehyde is classified as a carcinogen, meaning it has the potential to cause cancer. Its presence in dog shampoos can pose a risk not just to the dogs but also to their parents, as it can be inhaled during bath time.
• Skin and Respiratory Irritation: Exposure to formaldehyde can cause skin irritation and allergic reactions in dogs. It can also irritate the respiratory tract, leading to coughing and wheezing, which is particularly concerning for dogs with respiratory issues.

Safe Alternatives

• Sodium Benzoate: This is a natural preservative derived from benzoic acid found in fruits and spices. It’s effective in preventing bacterial growth and is a safer alternative to formaldehyde.
• Potassium Sorbate: Derived from sorbic acid, which occurs naturally in some berries, potassium sorbate is used to inhibit mold and yeast growth. It’s non-irritating and safe for use in dog shampoos.

Skip formaldehyde and all the other bad shampoo ingredients with 4Legger USDA Certified Organic Dog Shampoo. This shampoo is not only USDA certified organic but also free from harmful ingredients such as formaldehyde, parabens, sulfates, and artificial fragrances, making it a top-tier option for your dog’s skincare needs. Its organic formulation includes nourishing ingredients like coconut oil, olive oil, jojoba oil, and aloe vera, offering a gentle yet effective cleaning. This safe and non-toxic bath experience is ideal for dogs with sensitive skin or those prone to allergies.

#11 – Isopropyl Alcohol (Rubbing Alcohol)

Isopropyl Alcohol, commonly known as rubbing alcohol, is sometimes included in dog shampoo ingredients for its antiseptic properties. But it can be harmful to dogs.

Common Harmful Effects of Isopropyl Alcohol

• Skin Dryness and Irritation: Isopropyl alcohol can strip away natural oils from a dog’s skin, leading to dryness, irritation, and flakiness. It can be particularly harsh on dogs with sensitive skin.
• Toxicity: If ingested, isopropyl alcohol can be toxic to dogs. Given that dogs often lick their fur, the use of isopropyl alcohol in shampoos poses a significant risk.

Safe Alternatives

• Witch Hazel: This is a gentle alternative with antiseptic qualities. It soothes the skin and is effective in cleaning without the harsh effects of alcohol.
• Aloe Vera: Known for its soothing and healing properties, aloe vera is an excellent alternative for providing gentle, natural antiseptic benefits in dog shampoos. Natural Company Oatmeal Sensitive Skin Shampoo features the super soothing combo of oatmeal and aloe in an extra-gentle formula made for puppies and sensitive-skin dogs of all breeds, ages, and sizes. 

Embracing Dog Shampoos Without Harmful Ingredients

As we conclude our exploration of dog shampoo ingredients, it’s clear the choices we make in pet grooming products can significantly impact their health and well-being. By opting for shampoos free from harmful chemicals like SLS, DEA, and Parabens, and embracing natural alternatives, we not only safeguard our dogs’ skin and coat but also contribute to their overall health. The journey to a healthier life for our furry friends begins with us, their parents. We encourage you to apply this newfound knowledge when selecting your next dog shampoo, ensuring that each bath not only cleanses but also nurtures. Let’s commit to making informed, responsible choices for our pups. Happy grooming, and here’s to the health and happiness of your four-legged family members!

iHeartDogs is reader-supported. Some of the links below may be paid affiliate links, where we receive a small commission on a product at no additional cost to you.