# Is Glyphosate Toxic to Cats? Herbicide Safety Guide Is glyphosate toxic to cats? In most everyday situations, the answer is no. A cat that walks across a lawn sprayed with a diluted, dried homeowner product faces very low risk, because glyphosate is not a highly poisonous compound for mammals at typical exposure levels. The bigger dangers come from concentrated products, wet spray, and other ingredients mixed into the bottle. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Glyphosate itself has a low order of toxicity to domestic animals, and poisoning after normal use has not been reported [1]. - Cats do absorb and excrete glyphosate. In one study, glyphosate and its breakdown product were found in cat urine and feces, with higher levels in cats than in people or dogs [2]. - The highest risk is concentrated or undiluted product, spilled concentrate, or a cat licking a wet, freshly sprayed surface. - Drooling, vomiting, lethargy, or wobbliness after any herbicide exposure means call a veterinarian or a poison hotline the same day. - Never induce vomiting unless a veterinarian tells you to. ## Is Glyphosate Toxic to Cats? Glyphosate is the active ingredient in many weed killers sold for lawns, driveways, and gardens. It works by blocking a plant enzyme that animals do not have, which is one reason its toxicity to mammals is low. The Merck Veterinary Manual groups several herbicide classes by their risk to animals. It notes that some herbicides, such as aromatic and benzoic acid types, have a low order of toxicity to domestic animals, and poisoning after normal use has not been reported [1]. Glyphosate is not the same chemical class, but the general principle holds for many homeowner herbicides used as directed. That does not mean zero risk. It means the dose, the concentration, and the route of exposure decide what happens. ### What "diluted" versus "concentrated" means for your cat Concentrate is the product straight from the bottle before you mix it with water. It can contain surfactants and other ingredients that irritate skin, eyes, and the mouth far more than glyphosate alone. A cat that steps in a puddle of concentrate and then grooms its paws gets a much larger dose than a cat that walks on a lawn sprayed days ago. Ready-to-use sprays and diluted mixes are weaker. Once the spray dries, residue on grass is low. Most cats that walk on dried, treated grass and groom themselves afterward do not get sick. ### Roundup and cats Roundup is a brand name, and different Roundup products contain different ingredients and strengths. Some are ready-to-use, some are concentrates. The risk to your cat depends on which bottle you used, how wet the surface still is, and whether your cat licked or chewed the plant or the sprayer. If you are unsure which product you have, keep the label and call a veterinarian or poison hotline. They can look at the active and inactive ingredients with you. ## What Glyphosate Does in the Body When a cat swallows a small amount, glyphosate is absorbed through the gut and mostly leaves the body in feces, with some in urine. A 2025 study measured glyphosate and its degradation product, aminomethylphosphonic acid (AMPA), in paired urine and feces of people, cats, and dogs. The geometric mean concentration of the combined compounds in cat urine was 33.2 ng/mL, higher than in people (0.89 ng/mL) or dogs (8.38 ng/mL), and fecal levels were also higher in cats than in the other groups [2]. Those numbers show that cats are exposed to these chemicals in daily life, likely from food, water, dust, and surfaces. They do not prove that a single walk on sprayed grass causes poisoning. Excretion was mainly through feces, and the study estimated daily intake from those measurements [2]. ### What the research shows in animals Most of the detailed laboratory work on glyphosate has been done in fish, pigs, and reptiles, not cats. In carp, glyphosate exposure changed brain enzyme activity and antioxidant defenses, and the effects were worse when it was combined with an insecticide [3]. In pigs, low oral doses of glyphosate changed nerve signaling in the small intestine wall [4]. In caiman hatchlings, glyphosate formulations caused oxidative stress and DNA damage at concentrations used for soybean crops [5]. These findings tell us glyphosate is not biologically inert. They also involve species, doses, and routes that do not match a cat stepping on a lawn. Veterinary research has not established a clear poisoning threshold for cats from lawn residue. ### The other ingredients matter Many herbicide products include surfactants and solvents that help the spray stick to leaves. These can irritate a cat's mouth, throat, and stomach, and they can cause skin irritation. The Merck Veterinary Manual describes how contact with certain herbicide classes can irritate tissues, with mouth lesions seen after contact with recently sprayed pastures, and skin irritation and eye damage after external exposure [1]. That is a useful reminder that the carrier ingredients, not only the active herbicide, can cause signs. ## Glyphosate Poisoning Symptoms in Cats Signs depend on how much your cat took in and by which route. ### After licking or swallowing - Drooling and lip smacking - Vomiting - Mouth or throat irritation, pawing at the mouth - Lethargy or weakness - Wobbliness or unsteady walking - Loss of appetite - Diarrhea ### After skin or paw contact - Redness, itching, or irritation where the product touched the skin - Excessive grooming of the paws or belly - Hair loss or raw skin from over-grooming ### After eye contact - Squinting, tearing, redness, or swelling around the eye - Rubbing the face ### Timeline Mild mouth and stomach upset often shows up within minutes to a few hours of licking a wet product. Skin irritation can appear within hours. Lethargy and wobbliness are less common and suggest a larger exposure. If signs are going to appear, they usually do so within the first 24 hours. A cat that is completely normal 24 to 48 hours after a brief, dried-grass exposure is unlikely to develop delayed problems from that event. ## Cat Walked on Sprayed Grass: What to Do Right Now Stay calm and figure out three things: what product, how concentrated, and how wet the grass was when your cat walked on it. If the spray was dry and diluted, and your cat only walked on it, wipe the paws with a damp cloth and watch for signs. Most cats need nothing more. If the grass was still wet, or your cat licked its paws right after, or you used concentrate, take these steps. 1. Move your cat away from the area and into a clean, indoor space. 2. Wipe the paws, legs, and belly with a damp cloth, then dry. Do not scrub irritated skin. 3. If the product touched the eyes, flush with plain lukewarm water or saline for several minutes. 4. Do not induce vomiting unless a veterinarian tells you to. Some products cause more harm coming back up, and the wrong move can make things worse. 5. Call your veterinarian, the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661. Have the label, the product name, and your cat's weight ready. 6. Do not give food, milk, oil, or home remedies unless a veterinarian instructs you. If your cat is drooling heavily, vomiting repeatedly, wobbly, breathing hard, or unresponsive, treat it as an emergency and go to the nearest veterinary hospital now. ## Veterinary Treatment for Herbicide Exposure Your veterinarian will start with a physical exam and a history. They will ask what product was used, when it was applied, whether it was wet or dry, and how much your cat may have swallowed. Treatment is supportive and depends on the signs. Common steps include: - Washing the skin or flushing the eyes to remove residue - Activated charcoal or other decontamination, only if the veterinarian decides it is safe and the timing is right - Fluids under the skin or into a vein if your cat is dehydrated or vomiting - Anti-nausea medication and stomach protectors - A bland diet once vomiting stops - Blood work to check organ function if the exposure was large or signs are serious There is no specific antidote for glyphosate. The veterinarian calculates any medication dose from your cat's weight and health, so do not use leftover or human medicines at home. ## Outlook After Exposure The outlook is good for most small, incidental exposures. A cat that licks a small amount of dried residue usually has mild stomach upset at most and recovers with supportive care. The outlook is more guarded after a large swallow of concentrate, especially if the product also contains a strong surfactant. Serious cases can involve ongoing vomiting, dehydration, and, rarely, neurologic signs. Cats with liver or kidney disease, young kittens, and seniors may have less reserve. If your cat has a known exposure and is acting normally, your veterinarian may still want a phone check-in or an exam. That is a reasonable precaution, not a sign that something is definitely wrong. ## Prevention and Safer Alternatives Prevention is simpler than treatment. - Keep cats indoors during spraying and until the product has fully dried, usually several hours to a day depending on the label. - Read the label for re-entry times and follow them exactly. - Store concentrate in a locked cabinet, not a garage shelf a cat can reach. - Never transfer herbicide into a food or water container. - Rinse the sprayer and store it away from pet areas. - Wipe your cat's paws after any time outdoors in a treated area. - Cover or fence off treated spots if your cat goes outside. For weed control, hand pulling, mulching, and mowing are safe options. If you want to avoid chemical exposure entirely, focus on cat-safe plants indoors. Our guides on [What Plants Can Be Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/what-plants-can-be-toxic-to-cats) and [Non Toxic To Cats Houseplants](/knowledge/veterinary-medicine/toxicology-and-food-safety/non-toxic-to-cats-houseplants) can help you choose greenery that will not add another risk. If you already have lilies or other high-risk plants, see [Are Lilies Toxic to Cats?](/knowledge/veterinary-medicine/toxicology-and-food-safety/are-lilies-toxic-to-cats) for why those matter far more than a sprayed lawn. ## Limitations and When to Contact a Veterinarian This article cannot tell you what your specific cat absorbed. Only a veterinarian who examines your cat and knows the product can do that. Call your veterinarian or a poison hotline the same day if: - You saw your cat lick a wet or concentrated product - Your cat is drooling, vomiting, or refusing food - Your cat's paws, mouth, or eyes look irritated - You are unsure how much was swallowed Go to an emergency clinic now if: - Your cat is wobbly, collapsing, or having trouble breathing - Vomiting will not stop - Your cat is unresponsive or having tremors - You know or suspect a large swallow of concentrate Schedule a routine visit if: - Your cat seems fine but had repeated access to a treated area - Mild paw irritation is not improving after washing - You want blood work to check organ function after a bigger exposure ## Frequently Asked Questions ### Is Roundup safe for cats once it dries? Dried residue from a diluted, ready-to-use product is low risk for most cats. The main concern is a cat that licks or chews a treated plant right after spraying, or one that walks through wet concentrate. Keep cats away until the label's re-entry time has passed. ### How long after spraying is grass safe for my cat? Follow the label's re-entry time, which is usually several hours to a day. Rain and sunlight break down residue over time. If you are unsure, keep your cat off the area for a full day and wipe the paws afterward. ### Can my cat get sick from grooming after walking on sprayed grass? Mild drooling or one episode of vomiting is possible if the grass was still wet. Serious poisoning from dried lawn residue is uncommon. If your cat keeps vomiting, acts lethargic, or seems unsteady, call your veterinarian. ### Does glyphosate build up in a cat's body over time? The available data show glyphosate and its breakdown product are excreted, mainly in feces, so they do not appear to accumulate the way some persistent pollutants do. Cats in one study had measurable levels in urine and feces from everyday exposure. Long-term health effects in cats are not well established in veterinary research. ### What should I do if my cat licked glyphosate concentrate? Rinse the mouth with plain water if you can do it safely, do not induce vomiting, and call a veterinarian or poison hotline right away. Concentrate can irritate the mouth and stomach and may contain other ingredients that cause more harm than glyphosate alone. Bring the product label with you if you go to a clinic. ## Related Articles - [What Plants Can Be Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/what-plants-can-be-toxic-to-cats) - [Plants Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/plants-toxic-to-cats) - [Are Lilies Toxic to Cats?](/knowledge/veterinary-medicine/toxicology-and-food-safety/are-lilies-toxic-to-cats) - [House Plants Toxic To Cat](/knowledge/veterinary-medicine/toxicology-and-food-safety/house-plants-toxic-to-cat) - [Non Toxic To Cats Houseplants](/knowledge/veterinary-medicine/toxicology-and-food-safety/non-toxic-to-cats-houseplants) - [What Plants And Flowers Are Toxic To Cats](/knowledge/veterinary-medicine/toxicology-and-food-safety/what-plants-and-flowers-are-toxic-to-cats) - [Is Roundup Harmful to Cats and Dogs? Glyphosate Safety](/knowledge/veterinary-medicine/toxicology-and-food-safety/roundup-harmful-to-cats-dogs) - [Is Roundup Toxic to Cats? Herbicide Safety Facts](/knowledge/veterinary-medicine/toxicology-and-food-safety/roundup-toxic-to-cats) - [Is Weed Killer Harmful to Cats? Roundup and Lawn Safety](/knowledge/veterinary-medicine/toxicology-and-food-safety/weed-killer-harmful-cats) ## References 1. [Organic Herbicides Toxic to Animals - Toxicology](https://www.merckvetmanual.com/toxicology/herbicide-poisoning/organic-herbicides-toxic-to-animals). Merck Veterinary Manual. 2. [Occurrence and profiles of glyphosate and aminomethylphosphonic acid in paired urine and feces of humans, cats, and dogs](https://pubmed.ncbi.nlm.nih.gov/40311231/). Environment international, 2025. 3. [Single and Combined Effects of Chlorpyrifos and Glyphosate on the Brain of Common Carp: Based on Biochemical and Molecular Perspective](https://pubmed.ncbi.nlm.nih.gov/37629125/). International journal of molecular sciences, 2023. 4. [Glyphosate-induced changes in the expression of galanin and GALR1, GALR2 and GALR3 receptors in the porcine small intestine wall](https://pubmed.ncbi.nlm.nih.gov/38632282/). Scientific reports, 2024. 5. [Effects of glyphosate, 2,4-D, chlorantraniliprole, and imidacloprid formulations, separately and in mixtures in Caiman latirostris hatchlings](https://pubmed.ncbi.nlm.nih.gov/37150452/). Toxicology and applied pharmacology, 2023. ## Further Reading - [ASPCA Animal Poison Control Center](https://www.aspca.org/pet-care/animal-poison-control) - [ASPCA: People Foods to Avoid Feeding Your Pets](https://www.aspca.org/pet-care/aspca-poison-control/people-foods-avoid-feeding-your-pets) - [U.S. Food and Drug Administration: Potentially Dangerous Items for Your Pet](https://www.fda.gov/animal-veterinary/animal-health-literacy/potentially-dangerous-items-your-pet)