Mustard is a common condiment found in many kitchens. However, when it comes to sharing your snacks or meals with your furry friend, it’s good to ask, “can dogs eat mustard?” because the answer might surprise you. 

Briefly, the answer is a HUGE NO! Dogs cannot and should not eat mustard! Not only does it lack nutritional value, but it is also bad for dogs in so many ways. Let’s dive into it all in this article about mustard and dogs. 

Is Mustard Bad For Dogs?

Not every human food is safe for dogs! And when it comes to mustard, then all varieties of it, like mustard oil, mustard seed, or any dog food cooked with mustard, is a straight NO! Below are the reasons why you should never feed your dog mustard:

1. Toxic compounds

Mustard contains toxic compounds such as Glucosinolates, which are toxic to dogs if fed in large quantities (study). This is the same compound that is also found in broccoli and the reason behind giving your dog tummy issues. This takes us to our next point!

2. Gastrointestinal problems

If you feed your dog mustard in any way, it can lead to gastrointestinal problems. This can include vomiting, diarrhea, stomach ache, or even making your dog sick. Although a lick of mustard sauce will not ill your dog, more than a few licks definitely can. 

3. Allergic reactions

Lastly, every dog has different tolerance levels, and your dog might be allergic to mustard. In such cases, even small amounts of mustard in food can trigger allergies. This is why it is best to avoid feeding your dog mustard so your dog’s health remains good. 

a dog looks on grimly with a bottle of mustard in front of her

Signs And Symptoms to Look Out For

Now that you know mustard is not a suitable human food for dogs, we know you will try to keep your pooch far, far away from it. However, we all know dogs! If they get a chance to dig their nose into mustard sauce, they won’t think twice before doing it. This is why you should note the signs and symptoms your dog can show if they consume more than a few licks of mustard. Here is what you should look out for:

  • Vomiting
  • Diarrhea
  • Abdominal pain
  • Lethargy
  • Excessive thirst or urination (signs of possible kidney issues)
  • Difficulty breathing (in rare cases of allergic reactions)


Our final thoughts on “can dogs eat mustard?” are that you should not feed your dog mustard, mustard sauce, mustard oil, powder, or any mustard product. This can lead to toxicity, which might not be toxic to dogs but can most definitely make your dog sick. Instead, if you want to add the goodness of seeds and oils to your dog’s food, you should go for flaxseeds or sesame seeds

Frequently Asked Questions

What happens if my dog eats mustard?

Your dog may experience gastrointestinal upset and show symptoms like vomiting and diarrhea. This is why, if you know your dog has consumed mustard, contact your veterinarian immediately without waiting for the symptoms to hit.

Can dogs eat mustard and ketchup?

No. Both mustard and ketchup are toxic and bad for dogs in any quantity. Although ketchup is not toxic, it contains large amounts of sugar and sodium, which can make your dog sick.

Will a little mustard hurt my dog?

A small amount of mustard might not cause severe poisoning, but it can still lead to gastrointestinal discomfort. Hence, it would be best to avoid feeding your dog mustard altogether.

Can mustard help a dog throw up?

It is not recommended to use mustard to induce vomiting as it might worsen the situation. This is why you should please contact your veterinarian for advice if your dog is in such a situation.

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