Vegetables Dogs Shouldn’t Eat (Avoid These!)
So, you’ve decided to give your dog a veggie boost, and that’s fantastic. But, before you start tossing carrots and peas like confetti, let’s hit the brakes for a moment.
Not all vegetables are dog-friendly, and some can be downright dangerous for your furry friend.
Sure, the idea of sharing your green bean casserole might seem wholesome, but there are some veggies that should remain firmly off the menu.
Here’s a rundown of the veggies you need to steer clear of when it comes to your pup.
1. Onions
Onions are public enemy number one in the veggie world for dogs. Whether they’re raw, cooked, or even powdered, onions contain compounds that can be toxic to dogs.
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They can cause severe health issues, including damage to red blood cells, leading to anemia.
Keep an eye out for symptoms like vomiting, lethargy, or weakness if your dog gets into the onions. If you suspect onion poisoning, a trip to the vet is a must.
2. Garlic
Much like onions, garlic is a no-go. It’s packed with compounds that can cause gastrointestinal distress and damage red blood cells.

Even small amounts can be harmful, so it’s best to avoid garlic altogether. If your dog has a garlic-related mishap, look out for signs like excessive drooling or a loss of appetite.
3. Mushrooms
Mushrooms might seem like a harmless addition to your dog’s diet, but many varieties can be toxic.

Some mushrooms contain toxins that can cause severe gastrointestinal issues, liver damage, and even death. Stick to safe, dog-friendly treats and avoid giving your pup any wild or store-bought mushrooms.
4. Avocado
Avocados are a superfood for humans but not so much for dogs. They contain a substance called persin, which can be harmful to dogs.

While small amounts might not cause immediate issues, it’s best to keep avocados out of your dog’s diet. Symptoms of persin poisoning include vomiting and diarrhea.
5. Tomatoes
Tomatoes are another veggie that can be risky for dogs. While ripe tomatoes are less toxic than green ones, they still contain solanine, a compound that can cause gastrointestinal upset and lethargy.
Stick to dog-friendly veggies and keep those tomatoes off your pup’s plate.
6. Corn on the Cob
Corn on the cob might be a tasty summer treat for us, but it can be a choking hazard for dogs.

If your dog manages to chew on a cob, it could lead to an intestinal blockage. While corn itself is not toxic, the cob can cause serious problems. Opt for plain corn kernels instead, and make sure they’re fully cooked.
7. Rhubarb
Rhubarb contains compounds that can be toxic to dogs, leading to symptoms like drooling, vomiting, and diarrhea.

Keep this tart vegetable out of your dog’s reach, and make sure it’s not a part of any homemade treats.
8. Celery
While celery isn’t highly toxic, it can cause digestive issues and might be hard for some dogs to digest.

The high fiber content can lead to an upset stomach or even diarrhea if consumed in large quantities. If you want to share some veggies, it’s better to choose something that’s easier on their digestive system.
9. Spinach
Spinach contains oxalates, which can interfere with calcium absorption and cause kidney issues in dogs if fed in excess.

A small amount might not cause harm, but it’s better to opt for safer veggies that won’t upset your dog’s balance.
10. Beet Tops
Beet tops are high in oxalates, similar to spinach, and can cause kidney problems if given in large amounts.

Stick to safer veggie options to avoid any potential health issues.
FAQ
Q: What should I do if my dog eats a harmful vegetable?
A: If you suspect your dog has consumed a harmful vegetable, contact your veterinarian immediately. They can provide guidance on the next steps and help determine if any treatment is necessary.
Q: How can I safely introduce new vegetables to my dog’s diet?
A: Start by offering small amounts of a new vegetable and monitor your dog for any adverse reactions. Introduce one vegetable at a time and consult your vet if you’re unsure about any specific options.
Q: Are there any safe vegetables that are good for dogs?
A: Yes, many vegetables are safe and healthy for dogs, such as carrots, green beans, and sweet potatoes. Check our list of “Vegetables Dogs Should Eat” for some great options.
Q: Can dogs eat vegetables every day?
A: Vegetables should be offered as a treat or supplement, not a daily meal replacement. They can be a great addition to your dog’s diet, but their primary food should be a balanced, high-quality dog food.
Final Thoughts
Adding veggies to your dog’s diet can be beneficial, but it’s crucial to know which ones are safe and which ones are best avoided. Onions, garlic, and mushrooms are among the top offenders that should never make it to your dog’s bowl.
Stick to dog-friendly veggies, and you’ll have a happy, healthy pup enjoying their veggie treats without any trouble. Happy snacking!

I’ve spent 10+ years in dog training, digging into what makes dogs (and their humans) tick. At Smart Dog Learning, I share my no-nonsense, fun approach to training so you can enjoy life with a well-behaved, happy pup—no boring lectures, just practical results 😉