# Is Begonia Toxic to Dogs? Types and Risks Yes, begonias are toxic to dogs. The ASPCA lists Begonia species as toxic to dogs, cats, and horses because they contain soluble calcium oxalates, with the most toxic part being the underground tubers and roots [1]. If your dog chews or eats a begonia, the most likely result is mouth irritation, drooling, and vomiting, though the outcome depends on how much was eaten and which part of the plant was involved. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Nearly all begonias, including wax, rex, spotted (polka dot), Rieger, and strawberry begonias, are considered toxic to dogs because they contain soluble calcium oxalates [1][2][3]. - The underground parts (tubers, roots, and rhizomes) are the most toxic portion of the plant [1][2][3]. - Common signs after a dog eats begonia are vomiting and salivation, and grazing animals can develop kidney failure [1][2][3]. - Call your veterinarian, the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661 right away if your dog ate any part of a begonia. - Do not make your dog vomit unless a veterinarian tells you to. ## Is Begonia Toxic to Dogs? Yes. The ASPCA classifies Begonia spp. as toxic to dogs, and that single record covers more than 1,000 species and 10,000 hybrids [1]. That broad listing matters because it means the answer does not change much from one begonia to the next. The toxic principle is the same across the group, and the plant family Begoniaceae is consistently flagged as a risk to pets [1][2][3]. ### Is Begonia maculata toxic to dogs? Begonia maculata, often sold as the polka dot begonia or spotted begonia, falls under the same Begonia spp. umbrella. It is toxic to dogs for the same reason as other begonias, namely soluble calcium oxalates [1]. The spotted leaves make this plant popular, but the spots do not make it safer. ### Is rex begonia toxic to dogs? Yes. The ASPCA has a specific record for Rex Begonia (Begonia rex) and lists it as toxic to dogs, cats, and horses, with soluble calcium oxalates as the toxic principle [3]. There is also a separate record for a rex cultivar called Peace Begonia (Begonia rex 'peace'), which carries the identical toxicity listing [2]. So both the standard rex begonia and this named variety are treated the same way. ### Is wax begonia toxic to dogs? Wax begonias are the common bedding plants you see in garden centers and window boxes. They belong to Begonia spp., so they are toxic to dogs as well [1]. Because wax begonias are often planted at ground level where a dog can reach them, they may be one of the more likely begonias to be chewed. ### Is spotted begonia toxic to dogs? Spotted begonia is another common name for Begonia maculata, and it is toxic to dogs [1]. Any begonia marketed under a spotted or polka dot name still belongs to the same toxic genus. ### Is strawberry begonia toxic to dogs? Strawberry begonia is a common name that gets applied to more than one plant, which can make this confusing. If the plant in your home is a true begonia, it falls under the toxic Begonia spp. listing [1]. If you are not sure what you have, take a clear photo of the leaves and stems and show it to your veterinarian or a poison control service. ### Is Rieger begonia toxic to dogs? Rieger begonias, the winter-flowering begonias often given as gifts, are begonias and are therefore toxic to dogs [1]. Holiday and gift plants are a common source of pet exposures, and this is one to keep up high. ## Which Parts Are Toxic, and What About the Soil or Water? The most toxic part of a begonia is underground, meaning the tubers, roots, and rhizomes [1][2][3]. That is worth knowing because a dog who digs in a pot or garden bed may reach the most dangerous portion of the plant. Leaves, stems, and flowers still contain soluble calcium oxalates, so chewing any above-ground part can cause signs [1]. The amount of oxalate varies by species, by plant age, and by growing conditions, so there is no reliable way to judge risk from looking at a plant. Begonia tubers are sometimes confused with edible root vegetables. If a dog has access to stored tubers, bulbs, or a dug-up garden bed, treat that as a higher-risk exposure than a single nibbled leaf. ## The Toxic Principle: Soluble Calcium Oxalates Soluble calcium oxalates are the toxic compounds in begonias [1][2][3]. When a dog chews the plant, these crystals contact the moist tissues of the mouth, tongue, and throat. That contact causes intense irritation, which is why drooling and pawing at the mouth are common early signs. If plant material is swallowed, the irritation can extend to the stomach and intestines, leading to vomiting. Soluble oxalates can also be absorbed into the bloodstream. In grazing animals that eat large amounts over time, the oxalate binds calcium and can lead to kidney failure, which is why the ASPCA record notes kidney failure in grazing animals [1][2][3]. Dogs are not grazers, so the typical household exposure is much smaller. Still, a dog who eats a large amount of plant material, especially tubers, is a different situation than a dog who takes one bite. Plant poisonings in dogs are common enough that they show up regularly in poison center data. In one 12-year survey of plant exposures in domestic animals, dogs made up 61.8 percent of calls, and most exposures caused mild to moderate signs [4]. ## Signs of Begonia Poisoning in Dogs and the Timeline The ASPCA lists vomiting and salivation as the clinical signs in dogs and cats [1][2][3]. In practice, you may also see: - Drooling or foaming at the mouth - Pawing at the face or rubbing the muzzle - Mouth or lip swelling - Vomiting, sometimes repeatedly - Reduced appetite or reluctance to eat - Diarrhea - Lethargy or hiding Timing usually follows a pattern. Mouth irritation and drooling tend to start within minutes to a couple of hours of chewing. Vomiting often follows within a few hours. Signs that persist beyond a day, or that get worse instead of better, deserve a recheck. Most plant exposures in dogs cause mild to moderate signs, and fatal outcomes are less common [4]. That said, a dog who eats a large amount of tubers, or who has an underlying health problem, can have a more serious course. ## What to Do Right Now If you saw your dog eat a begonia, or you found chewed leaves and a drooling dog, act quickly. 1. Move your dog away from the plant and remove any plant material from the mouth if you can do so safely. Do not put your fingers deep into the throat of a dog who is agitated or vomiting. 2. Call your veterinarian, the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661. Have the plant name, the part eaten, and your dog's weight ready. 3. Do not induce vomiting unless a veterinarian tells you to. Begonia plant material is irritating, and making a dog vomit can cause more damage on the way back up. 4. Do not give food, milk, oil, or home remedies to "soak up" the plant. These can complicate treatment and delay real care. 5. Save a sample of the plant, including a leaf and a photo of the whole plant, so the veterinarian can identify it. If your dog is having trouble breathing, is collapsing, or has a swollen face or throat, go to an emergency clinic immediately. ## Veterinary Treatment for Begonia Exposure Treatment depends on how much was eaten and how your dog looks. For a small chew with mild drooling, your veterinarian may recommend rinsing the mouth, offering water, and monitoring at home. For a dog with repeated vomiting, treatment often includes: - Intravenous fluids to support hydration and kidney function - Medications to control nausea and vomiting - Medications to soothe stomach and mouth irritation - Blood work to check kidney values and electrolytes - Activated charcoal or other decontamination measures in selected cases Your veterinarian calculates any medication dose from your dog's weight and health status. There is no at-home dose you should try to give on your own. If you are also worried about other household items your dog may have chewed, our guide to [Plants Poisonous To Dogs](/knowledge/veterinary-medicine/toxicology-and-food-safety/plants-poisonous-to-dogs) covers the broader list, and [My Dog Ate a Pen: Is It Toxic or Just a Blockage Risk?](/knowledge/veterinary-medicine/vet-visit-decisions/dog-ate-pen-toxic-or-blockage) explains how vets sort out toxic risks from blockage risks. ## Outlook After a Begonia Exposure For most dogs who nibble a begonia leaf, the outlook is good. Signs are usually limited to the mouth and stomach, and they often settle within a day or two with supportive care [1]. The outlook is more guarded when a dog eats a large amount of plant material, especially tubers or roots, because that is the most toxic part [1][2][3]. Dogs with pre-existing kidney disease, very young puppies, and senior dogs may also be more vulnerable. If your dog needed treatment, ask your veterinarian when to recheck blood work. Kidney values can change over time, and a single normal result right after exposure does not always tell the whole story. ## Prevention and Safer Alternatives The simplest prevention is to keep begonias out of reach. That means: - Place begonias on high shelves, in hanging baskets, or in rooms your dog cannot enter. - Keep potted begonias off the floor and away from dog beds and food bowls. - Fence off garden beds where wax begonias are planted. - Store tubers and bulbs in sealed containers your dog cannot open. - Teach a solid "leave it" cue and reward your dog for ignoring plants. - Check new plants before you bring them home, since gift plants and holiday arrangements often include begonias. If you want a dog-safe houseplant, choose a species listed as non-toxic by the ASPCA and confirm the exact plant name before buying. When you are unsure, ask your veterinarian or a poison control service to identify the plant from a photo. If your dog has a habit of eating plants, it is worth mentioning at your next routine visit. Some dogs chew plants out of boredom or stomach upset, and a behavior plan can reduce repeat exposures. For dogs with a known sweet tooth, our guide to [How Much Chocolate Can Be Toxic To Dogs](/knowledge/veterinary-medicine/toxicology-and-food-safety/how-much-chocolate-can-be-toxic-to-dogs) is a useful companion read, since chocolate is a far more common household toxin than begonias. ## Limitations and When to Contact a Veterinarian This article cannot tell you how serious your dog's specific exposure is. The amount eaten, the plant part, your dog's size, and your dog's health all change the picture, and only a veterinarian who examines your dog can give you a real answer. Contact a veterinarian the same day if your dog ate any part of a begonia, especially if you are not sure how much was eaten, if your dog is a puppy or senior, or if your dog has kidney disease. Go to an emergency clinic now if your dog has repeated vomiting, cannot keep water down, is breathing fast or with effort, has a swollen face or throat, is collapsing, or seems weak and unresponsive. Schedule a routine visit if your dog had a mild chew with no signs, so your veterinarian can document the exposure and decide whether blood work is needed. If you are unsure which category your dog falls into, call first. A phone call costs nothing and can save time. ## Frequently Asked Questions ### Are all begonias toxic to dogs? Yes, begonias as a group are listed as toxic to dogs, and that listing covers over 1,000 species and 10,000 hybrids. The toxic principle is soluble calcium oxalates, and the underground parts are the most toxic. If you have a plant labeled begonia, treat it as toxic unless a veterinarian or poison control tells you otherwise. ### Will my dog get sick from just one bite of a begonia? Many dogs who take a single bite develop drooling, mouth irritation, or one episode of vomiting, and some develop no signs at all. The reaction depends on how much plant material was chewed and swallowed and how sensitive your dog is. Call a veterinarian or poison control for advice even if your dog seems fine at first. ### How long do begonia poisoning signs last in dogs? Mouth irritation and drooling often start within minutes to a couple of hours, and vomiting usually follows within a few hours. With supportive care, most mild cases improve within a day or two. Signs that last longer or get worse need a recheck. ### Should I make my dog vomit after eating a begonia? No, do not induce vomiting unless a veterinarian specifically tells you to. Begonia plant material is irritating to the mouth and throat, and bringing it back up can cause more injury. Call your veterinarian or a poison control service and follow their instructions. ### Are begonia tubers more dangerous than the leaves? Yes, the underground parts, including tubers, roots, and rhizomes, are the most toxic part of the plant. A dog who digs up and eats tubers has a higher-risk exposure than a dog who nibbles a leaf. If your dog ate tubers, call a veterinarian or poison control right away. ## Related Articles - [Plants Poisonous To Dogs](/knowledge/veterinary-medicine/toxicology-and-food-safety/plants-poisonous-to-dogs) - [How Much Chocolate Can Be Toxic To Dogs](/knowledge/veterinary-medicine/toxicology-and-food-safety/how-much-chocolate-can-be-toxic-to-dogs) - [My Dog Ate a Pen: Is It Toxic or Just a Blockage Risk?](/knowledge/veterinary-medicine/vet-visit-decisions/dog-ate-pen-toxic-or-blockage) - [Are Tarantulas Poisonous to Dogs? Understanding the Risks](/knowledge/veterinary-medicine/pet-care/are-tarantulas-poisonous-to-dogs-understanding-the-risks) - [Chocolate Toxicity Calculator Canine](/knowledge/veterinary-medicine/toxicology-and-food-safety/chocolate-toxicity-calculator-canine) - [Can I Give My Dog Benadryl? Dosage, Safety, and When to Call the Vet](/knowledge/veterinary-medicine/vet-visit-decisions/can-i-give-my-dog-benadryl-dosage-safety) - [Are Begonias Toxic to Cats? Types and Symptoms](/knowledge/veterinary-medicine/toxicology-and-food-safety/begonias-toxic-to-cats) - [Are Begonias Toxic to Dogs? Angel Wing and Dragon Wing Risks](/knowledge/veterinary-medicine/toxicology-and-food-safety/begonia-toxic-to-dogs) - [Is Philodendron Toxic to Dogs? Varieties and Symptoms](/knowledge/veterinary-medicine/toxicology-and-food-safety/philodendron-toxic-to-dogs) ## References 1. [Toxic and Non-toxic Plants: Begonia](https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/begonia). ASPCA Animal Poison Control Center. 2. [Toxic and Non-toxic Plants: Peace Begonia](https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/peace-begonia). ASPCA Animal Poison Control Center. 3. [Toxic and Non-toxic Plants: Rex Begonia](https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/rex-begonia). ASPCA Animal Poison Control Center. 4. [Plant poisoning in domestic animals: epidemiological data from an Italian survey (2000-2011)](https://pubmed.ncbi.nlm.nih.gov/23716536/). The Veterinary record, 2013. ## 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)