Vegetables as a snack for your dog? It's possible, but not every vegetable is suitable. Onions, garlic, leeks, and chives are toxic to dogs, even when cooked or dried (Cortinovis & Caloni, 2016).
Which vegetables are toxic to dogs?
Onion, garlic, leek, and chives are toxic to dogs. They are all plants from the Allium family. They contain substances (organosulfoxides) that can damage red blood cells. Cooking, drying, or processing does not remove this toxicity (Cortinovis & Caloni, 2016).
This means that leftovers from your own plate can also be a risk, for example, if there is onion or garlic in the dish. Therefore, give your dog a separate piece of vegetable and not a bite from your own pan.
Grapes, avocados, and raisins also don't belong, even though they aren't vegetables. They can cause kidney failure in dogs. The mechanism is unknown, and sensitivity varies enormously: some dogs became severely ill from a handful, while others remained symptom-free after a much larger quantity (Cortinovis & Caloni, 2016). It is therefore impossible to say in advance what quantity is safe.
Which raw vegetables are suitable as a snack?
You can give many other vegetables, such as carrots or cucumbers, to your dog. When in doubt, always check with your veterinarian about what is or is not allowed.
How much vegetable can you give as a snack?
Count vegetables as a snack and keep all snacks together under about one-tenth of your dog's daily energy. This is in line with the recommendation from WSAVA and AAHA that complementary food, such as snacks, should not exceed one-tenth of daily calories (Príncipe et al., 2025). That advice concerns snacks in general, not specifically vegetables.
A calculation example: everything you give extra, from a piece of vegetable to a kibble as a reward during training, falls under that tenth. If you give a lot of snacks on one day, there is less room for others. This way, you keep an overview of what your dog is actually consuming.
Snacks are a treat and not a meal replacement. You can find the feeding amount that matches your dog's weight in the feeding guide next to the kibble in our Dog Kibble collection. A puppy needs different kibble than an adult dog, because they have different nutritional needs while growing. Therefore, always choose food that suits your dog's life stage.
What other food items do not belong in the snack bowl?
Macadamia nuts, xylitol, chocolate, and caffeine are also toxic to dogs. With macadamia nuts, even a small amount, from about 0.7 grams per kilo of body weight, caused symptoms such as weakness in the hind legs, tremors, and an elevated body temperature. Usually, dogs recover within one to two days (Cortinovis & Caloni, 2016).
Xylitol is a sweetener that can cause a sharp drop in blood sugar levels in dogs, even in very small amounts (Cortinovis & Caloni, 2016). It is found in some peanut butters and other spreads. So read the ingredient list before you put anything on a snack. This keeps the snack bowl safe, even if you combine vegetables with a seasoning.
What do you do if your dog has eaten something toxic?
Call your veterinarian immediately if your dog has eaten onion, garlic, leek, chives, grapes, or raisins, even if they do not yet have symptoms. There is no specific antidote for onion and garlic. Veterinarians can induce vomiting in dogs without symptoms within about two hours, administer activated charcoal, and provide supportive treatment; in cases of severe anemia, a blood transfusion may sometimes be required (Cortinovis & Caloni, 2016).
After grapes or raisins, the authors recommend an intensive approach with an IV drip and kidney monitoring for at least 48 to 72 hours (Cortinovis & Caloni, 2016). This is a job for the veterinarian. Do not try this yourself at home.
So ALWAYS contact your veterinarian immediately!
Prefer a ready-made snack?
Do you want something convenient to take with you in addition to vegetables? In our (Dental) Snacks collection, you will find plant-based chew snacks. These are complementary snacks, not a meal: give a maximum of one piece per day and supervise your dog. Are you in doubt about what suits your dog? Take a look at the frequently asked questions or send us a message via the contact page. The ready-made snacks are obviously safe for your dog to eat.
Frequently asked questions
Are some breeds more sensitive to onion and garlic?
Yes, possibly. According to the review article, the Akita, Shiba, and Jindo, among others, are more sensitive to the toxic substances in Allium plants (Cortinovis & Caloni, 2016). If you have such a breed, be extra alert. For all dogs, the rule applies: keep onion, garlic, leek, and chives out of the snack bowl.
Can I use vegetables as a reward during training?
Yes, but a reward is also a snack. So count pieces of vegetable within your dog's snack allowance, which is about one-tenth of daily energy (Príncipe et al., 2025). Keep pieces small and choose one type at a time so you know what your dog tolerates well.
Can vegetables replace part of a meal?
No, vegetables as a snack are an extra and do not replace a meal. According to the guidelines, complementary food should make up a maximum of one-tenth of daily energy (Príncipe et al., 2025). The rest should come from food that suits your dog's life stage. Do you want to adjust the feeding amount? Discuss that with your veterinarian.
What if my dog does not tolerate a new vegetable well?
Stop giving that vegetable and do not give it again. Keep an eye on your dog's stool and behavior. If symptoms persist or you are worried, contact your veterinarian. You can always reach us regarding our own products via the contact page.
David is the founder of VerdaDog. He grew up with a dog that struggled with allergies, and that got him thinking about how he could prevent that with his own dog. He has been eating plant-based himself for over ten years, and that interest in nutrition, for himself and his dog, forms the basis of VerdaDog. This article was written based on peer-reviewed research. David does not claim veterinary or scientific expertise and always refers to a veterinarian for medical advice. When in doubt, ALWAYS contact a veterinarian.
Sources
Buff, P. R., Carter, R. A., Bauer, J. E., & Kersey, J. H. (2014). Natural pet food: A review of natural diets and their impact on canine and feline physiology. Journal of Animal Science, 92(9), 3781–3791. https://doi.org/10.2527/jas.2014-7789
Cortinovis, C., & Caloni, F. (2016). Household food items toxic to dogs and cats. Frontiers in Veterinary Science, 3, Article 26. https://doi.org/10.3389/fvets.2016.00026
Fritsch, D. A., Jackson, M. I., Wernimont, S. M., Feld, G. K., Badri, D. V., Brejda, J. J., Cochrane, C.-Y., & Gross, K. L. (2023). Adding a polyphenol-rich fiber bundle to food impacts the gastrointestinal microbiome and metabolome in dogs. Frontiers in Veterinary Science, 9, 1039032. https://doi.org/10.3389/fvets.2022.1039032
Príncipe, L. d. A., Marchi, P. H., Amaral, A. R., Pedrinelli, V., Zafalon, R. V. A., Romano, F. S., Balieiro, J. C. d. C., & Vendramini, T. H. A. (2025). Assessment of the nutritional impact of the 10% snack recommendation in pet diets. Veterinary Sciences, 12(3), 282. https://doi.org/10.3390/vetsci12030282
