Since the beginning of time, both wild and domesticated Allium species have been employed in food and traditional medicine.
Since the beginning of time, both wild and domesticated Allium species have been employed in food and traditional medicine. In North America, there are about 95 species of native or cultivated leeks, chives, garlic, shallots, scallions, and onions. Additionally, there are more than 80 species of ornamental Allium. Dogs and cats can be harmful to all Allium species and their products1, but only a small number of Allium species are of significant toxicologic concern.
Domesticated varieties of Allium cepa (onion), Allium porrum (leek), Allium sativum (garlic), and Allium schoenoprasum are frequently engaged in toxicosis (chive). When crushed, the plants release an onion or garlic scent and develop solitary or clustered bulbs. Allium species can be distinguished from dangerous plants with visually identical leaves by their distinctive odour, especially death camas (Zigadenus species). 1
Toxicity
Numerous organosulfoxides, in particular alk(en)ylcysteine sulfoxides, are present in allium species. Chewing or other plant trauma transforms organosulfoxides into a complicated brew of organic molecules that contain sulfur. Many of these substances, or their metabolites, are in charge of giving these plants their distinctive scents, tastes, and pharmacological effects. Many of the organosulfur compounds found in Allium species seem to be easily absorbed by the digestive system and are converted into highly reactive oxidants. 2 Allium species’ potential toxicity is not diminished by cooking or rotting. 1
Mechanism of action
The main toxicologic mechanism for organosulfur compounds formed from Allium species is oxidative hemolysis, which happens when the amount of oxidants in an erythrocyte exceeds the capability of the metabolic pathways that produce antioxidants. Dog erythrocytes have low catalase antioxidant activity3, and cat normal hemoglobin is about two to three times more vulnerable to oxidative damage than normal hemoglobin in other species. 4
Sulfhemoglobin is created when exposed beta-93 cysteine residues in hemoglobin undergo oxidation.
5 Sulfhemoglobin precipitates, aggregates, and attaches to the cell membrane to form Heinz bodies because it is less soluble than hemoglobin. The production of eccentrocytes and membrane cross-linking processes are the results of other forms of hemoglobin oxidation. 6 Erythrocyte fragility and extravascular hemolysis are increased by the development of Heinz bodies and eccentrocytes. Cell lysis is also caused by direct oxidative damage to the erythrocyte cell membrane and its sodium-potassium pump or by the oxidative synthesis of hemin. Oxidation of the heme ion and related methemoglobinemia cause the hemoglobin-oxygen dissociation curve to move to the left, blood oxygen transport capacity to be reduced, and eventually poor oxygen delivery to the tissues.
Thus, the start of anemia, methemoglobinemia, and reduced oxygen transport are caused by the oxidative hemolytic process generated by ingestion of Allium species. A day after eating onions, there may be noticeable Heinz body formation, but the anemic nadir usually appears several days later.
The pharmacologically active components of garlic, allicin and ajoene, are strong vasodilators, hypotensive, and cardiac and smooth muscle relaxants.
7-9 Additionally, onions’ organosulfur components, such as ajoene, are effective antithrombotic medicines. 10 Therefore, hypotensive and antithrombotic actions may make anemia and poor oxygen transport worse from a physiological standpoint. Unaged garlic formulations directly harm the stomach and ileal mucosa, causing discomfort and diarrhea. 11
Exposure and susceptibility
The most frequent cause of allium species toxicosis is oral ingestion. In addition to ingesting fresh plant material, dogs and cats may be poisoned by drinking juice, fresh and aged dietary supplements, powdered cookery preparations, dried material, or food preparations made with or containing Allium species. 1 Allium species toxicosis often develops following consumption of either a single big quantity or repeated little doses of the substance. Onion toxicosis is quite dangerous for dogs and cats. Even a little amount of onion consumption—5 g/kg for cats and 15 to 30 g/kg for dogs—has been linked to clinically significant hematologic alterations. Animals that consume more than 0.5 percent of their body weight in onions at once frequently develop onion toxicosis.
Dogs with heritably high levels of potassium and erythrocyte reduced glutathione are more vulnerable to the hematologic effects of onions.
12 Japanese breeds are comparatively prone to this characteristic. An animal’s sensitivity to the toxicity of Allium species may be increased by further inborn metabolic flaws or dietary inadequacies, such as zinc or glucose-6-phosphate dehydrogenase insufficiency, which lower erythrocyte antioxidant defenses. 13 An animal’s susceptibility to Allium species toxicosis is likely to be increased by concurrent treatment with xenobiotics, medications, or dietary elements that cause erythrocyte oxidative injury (e.g., propofol, propylene glycol, dl-methionine, sulfonamides, sulfapyridine, high doses of vitamin K3, benzocaine) or weaken erythrocyte oxidative
Clinical signs and laboratory findings
If considerable amounts of the substance have been consumed, clinical signs of Allium species toxicosis in dogs and cats may arise within a day of intake; however, it is more typical for clinical signs to appear after a delay of several days. Depression, hemoglobinuria, urinary casts of hemosiderin and/or hemoglobin, icterus, tachypnea, tachycardia, weakness, exercise intolerance, and cold sensitivity are common clinical symptoms. Additionally possible symptoms include nausea, diarrhea, and stomach pain. The sick dog or cat may have an onion or garlic breath odor if they recently consumed something.
Clinical pathology results support the presence of intravascular and extravascular hemolysis, Heinz body anemia, eccentrocytosis, hemoglobinemia, hemoglobinuria, hyperbilirubinemia, methemoglobinemia, and, if the animal survives long enough, a concomitant regenerative response.
1
Hemolytic anemia is often diagnosed through necropsy and histologic findings. Gastrointestinal erosion or Allium species in the gut content may not be seen due to the typical delay of several days between consumption and the onset of clinical indications. The presence of hemosiderin in the phagocytic cells of the liver, spleen, and renal tubular epithelium; renal tubular pigment necrosis; and the presence of nephrotubular casts and hemoglobin casts in the renal tubules are histopathologic findings that, while consistent with hemolytic anemia, are not specific to Allium species toxicosis. 1
Differential diagnoses
Other typical toxicoses such as brassicaceous vegetables, propylene glycol, acetaminophen, benzocaine, vitamin K3, dl-methionine, naphthalene, zinc, and copper are differentially diagnosed. Diabetes mellitus, particularly if ketoacidosis is present, hepatic lipidosis, hyperthyroidism, lymphoma and other neoplasms, as well as hyperthyroidism are common feline diseases linked to the development of Heinz bodies.
Diagnosis and treatment
A history, clinical symptoms, and microscopic evidence of a hemolytic anemia with a Heinz body are commonly used to diagnose allium species toxicosis.
There isn’t a specific treatment for toxicosis caused by Allium species. In order to treat anemia, the gastrointestinal tract must be decontaminated, the source of the Allium species must be eliminated, and general supportive care must be given. As long as there are no aggravating conditions and the ingestion occurred within the previous one to two hours, inducing emesis can be helpful in asymptomatic dogs and cats. After emesis, you might want to provide activated charcoal. A blood transfusion and further oxygen therapy may be required in animals that are badly afflicted. If there has been significant vomiting and/or diarrhea, there is obvious hemoglobinuria, or there is hypotension, intravenous crystalloids should be administered.
For many days following intake, keep a close eye on the patient’s erythron levels because it is when the anemic low generally happens. In cats with onion powder toxicosis, antioxidants including sodium ascorbate, vitamin E, and N-acetylcysteine barely show any protective benefits. 14 Diets low in potential oxidants are advised; propylene glycol-containing semi-moist foods should be avoided, especially in cats. 15
The type of plant implicated, the degree of anemia, and the implementation of supportive care all affect the patient’s prognosis. Avoiding exposure is the best protective measure for companion animals. Stop giving pets onions, other Allium species, or their derivatives.
Are any alliums poisonous?
Alliums are safe to eat for humans but harmful to dogs and cats, according to The Washington Post. Never serve a dog or cat table food that has been seasoned with onion or garlic, especially if your pets have access to them. Additionally, theKitchen advises against eating any wild plants that mimic alliums since they can be hazardous imposters. Don’t overindulge if you’ve positively identified a wild allium; some varieties are stronger and can upset your stomach.
Can dogs eat decorative onions?
Allium plants, which include leeks, chives, garlic, and onions, are toxic to both dogs and cats. Compared to onions, garlic is thought to be around five times as potent. Cats and Japanese dog breeds are among the species and types that are particularly sensitive (e.g., Akita, Shiba Inu). Toxic dosages of onion and garlic can result in gastroenteritis and oxidative damage to the red blood cells, which increases the risk of the red blood cells rupturing (e.g., nausea, oral irritation, drooling, abdominal pain, vomiting, diarrhea). Lethargy, pale gums, an elevated heart rate, an elevated respiratory rate, weakness, sensitivity to strenuous activity, and collapse are further clinical indications of anemia that can also appear. Clinical symptoms of onion and garlic poisoning may not appear for several days and may begin slowly.
Which flower is toxic to canines?
Risky Outdoor Plants Popular garden plants that are poisonous include Azalea, Buttercups, Chrysanthemums, Gardenias, Gladiolas, Hibiscus, Hyacinth, Hydrangeas, Mums, Primroses, Rhododendrons, and Sweet Peas. That’s simply one more compelling argument against letting your canines explore your neighbor’s prize-winning flower bushes.
What would happen if my dog consumed a small amount of onion?
Mild exposure to onions or garlic will probably not kill dogs, but severe poisoning can be lethal, especially if it goes untreated. Even if there are no outward symptoms, you should take your dog to the vet right away if you know he ate too many onions or garlic.
The best strategy to manage the condition is to prevent exposure. When giving your dog any food intended for people, be sure there are no onions, garlic, or other allium items on the list of ingredients. Continual low doses will make any accidental consumption far more severe, even if your dog shows no symptoms. Any damaged food that includes goods made of onions or garlic should be disposed of in a garbage disposal or placed in a closed trash container. If you have any allium species growing in your garden, take precautions. Although dogs typically don’t enjoy the flavor of these plants, it is safer to keep them out of the reach of canines.
Can my dog get damaged by one onion ring?
Dogs can’t eat onion rings, sorry. In actuality, they are far more harmful to your dog than raw onions. Onion rings are fried in addition to having pollutants that can harm your dog. In general, dogs should not eat any fried food.
Fried foods are undoubtedly bad for your pets if they aren’t healthy for you to eat. Your dog might not suffer much damage if they unintentionally eat an onion ring that dropped on the ground. However, it’s wise to keep a watch on them to determine whether they exhibit any of the warning signs mentioned above.
Consult with your veterinarian as soon as possible if your dog consumed the entire plate of onion rings. If your dog ate a sizable amount of onions or onion rings, you can take the measures mentioned above.
How can I tell if my dog has been poisoned by onions?
There are a few anemia symptoms to watch out for if you believe your dog may have consumed onions:
- Lethargy
- Weakness
- a diminished appetite
- White gums
- Fainting
- bloodshot urine
The ASPCA adds other symptoms of onion toxicity, such as vomiting, rapid heartbeat, and panting.
The greatest thing you can do to help your dog if he displays any of these signs is to take him to the vet as soon as you can. Based on his symptoms and a blood test, your dog’s condition will be determined by your veterinarian. All indications point to onion toxicity if your veterinarian discovers hemolytic anemia or the presence of Heinz bodies on a blood smear along with a recent history of exposure to onions.
To ensure your dog receives the best therapy, get a proper diagnosis as other illnesses might potentially result in hemolytic anemia.
How long does canine onion poisoning last?
Clinical symptoms can appear up to 7 days after eating the dish, however they usually appear within 24 hours.
Who or what consumes Allium flowers?
Animals of many kinds will eat flower bulbs. The problem is typically caused by mice, but it can also be caused by squirrels, chipmunks, voles, and gophers.
A gardener may frequently also accuse moles of the problem, however moles don’t consume plant roots or bulbs. The common culprits mentioned above are most likely to enter your spring flower bulbs through a mole burrow.
Are dogs poisonous to lavender?
Linalool, a substance found in lavender plants, is poisonous to some animals, including dogs and cats. Linalool levels in the plant are so low, though, that poisoning is rarely an issue.
When dogs consume a large amount of lavender, problems arise. Dogs who consume large doses of linalool may experience seizures, drowsiness, vomiting, and other severe symptoms.
Because it is highly concentrated, linalool is present in large amounts. Your dog could become ill with even a modest amount of consumption.
When using lavender oil to your dog, always take safety precautions. This entails extensively diluting it before usage and just utilizing the tiniest amount required for treatment.
What plants are the most dangerous to dogs?
Dogs are poisonous to a lot of plants. Deterring them from chewing on or consuming any vegetation is therefore always a good idea, especially the following plants.
The following plants should never be made available to dogs under any circumstances since they are the most harmful to them:
- Castor oil or castor bean (Ricinus communis)
- Cyclamen (Cylamen spp.)
- Dumbcane (Dieffenbachia)
- Hemlock (Conium maculatum)
- English ivy’s fruit and leaves (Hedera helix)
- Mistletoe (Viscum album)
- Oleander (Nerium oleander)
- Apple thorns or jimsonweed (Datura stramonium)
- Yew (Taxus spp.)
- any fungus you cannot reliably identify as safe
For a number of reasons, it is best to stay away from this kind of plant. Do not grow them close to your house or bring cut flowers or plants inside:
- Amaryllis (Amaryllis spp.)
- Fall crocus (Colochicum autumnale)
- bloody heart (Dicentra spectabilis)
- Bloodroot (Sanguinaria canadensis)
- Chrysanthemum (Compositae spp.)
- bulbs of any variety of flowers
- Foxglove (Digitalis purpurea)
- Israeli cherry (Solanum pseudocapsicum)
- Larkspur (Delphinium)
- Flower of the valley (Convallaria majalis)
- Marijuana (Cannabis sativa)
- Mauna Loa peace lily or peace lily (Spathiphyllum spp.)
- Pothos (both Scindapsus and Epipremnum)
- Rhubarb (Rheum rhaponticum)
- Schefflera (Schefflera and Brassaia actinophylla)
- Navel nettles (Urtica dioica)
- Bulbs of tulips and narcissus (Tulipa/Narcissus spp.)
- Maryland creeper (Parthenocissus quinquefolia)
Avoid using these tougher-leafed or woody species in and around your home as they are harmful as well.
- Azalea
- Box
- Beijinger tree
- Horsechestnut
- Laburnum
- Oleander
- Privet
- Palm Sago
- Rhododendron
- Wisteria
Additionally, the ASPCA has a comprehensive list of toxic and non-toxic plants, and the Pet Poison Helpline has a list of the Top 10 Plants Poisonous to Pets.