My Dog Ate Blue Cheese Will He Get Sick? (Reviewed by Vet)

Reviewed By Evie Moloney, RCVS •  Updated: 02/06/23 •  4 min read
Dog Moderate Toxicity Level
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Dog Ate Blue Cheese

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Blue cheese is a favorite of many pet parents.

But is blue cheese dangerous for dogs? If your dog eats blue cheese, will he get sick?

What is Blue Cheese

Blue cheese is a dairy product that comes in a wide variety of flavors and textures. This type of cheese can be identified by the blue veins that run through the cheese. The blue veins are a type of mold, which is most often Penicillium roqueforti, which is a fungus used in cheese making.

It is strongly recommended to contact a Pet Poison Helpline or your veterinarian.

The mold veins are created in the production stage of the cheese. During this process, small stainless-steel rods are poked into the cheese. This allows air to enter the cheese, which allows mold to grow. After this, the cheese is aged in a temperature-controlled environment. As the mold grows, it affects changes in the cheese’s flavor, smell, and more.

There are several types of blue cheese including Roquefort, Gorgonzola, Stilton, and even more. Blue cheese is considered to be very healthy for humans, but we need to be careful with it for our pets as it can cause problems for them.

Is Blue Cheese Safe for Dogs?

The answer is it depends. For one thing, dogs shouldn’t eat too much salt, so blue cheese should never be given to your dog in large amounts. As a treat once in a while, your dog will be may be tolerated by your dog, but there are much safer treats than blue cheese that are available for your dog.

Many dogs can be lactose intolerant and/or have a dairy allergy, so blue cheese is not recommended for them.. In general, it is not recommended to give any dogs dairy products as it can cause tummy upset (gastroenteritis) including vomiting and diarrhea.

Another potential problem with feeding blue cheese is that some blue cheeses can go bad and create a toxic (poisonous) substance called Roquefortine C. It usually develops in cheese that has gone bad or is past its use-by-date. Dogs often get into the trash bin and eat the gone-off cheese, and it can make them very sick

What Happens When Dogs Eat Blue Cheese

Like cottage cheese, cream cheese or goat cheese, blue cheese contains a lot of . Pancreatitis can appear when a dog’s diet has been composed of a high amount of human foods especially cheese. Diarrhea and vomiting are common after a dog has eaten too much cheese. This is because the fat content can upset their tummy (digestive system) and cause irritation of their pancreas (an organ in the digestive system). These issues can make your furry friend feel very unwell and it is recommended to contact your veterinarian for individual advice for them..

Pet parents should restrict feeding high fat foods like cheese to very small quantities. Ideally give their fur babies healthy dog specific treats instead.

Symptoms of Roquefortine C Poisoning in Dogs

You may notice these symptoms of Roquefortine C poisoning in your dog if he’s eaten spoiled blue cheese:

If you know or suspect your dog has eaten spoiled blue cheese, then call the vet immediately. Dogs eating spoiled blue cheese can be very harmful and your veterinarian may recommend you bring your pet in for an examination and  possible treatment plan.

In general, pets tend to respond well to medical treatment, but it is important to contact your vet if you have a suspicion that your pet may have eaten spoiled blue cheese. If they have recently eaten it (usually within 12 hours of eating it), they may recommend a consult to make your dog vomit up the cheese, and possibly some other medical treatment depending on your pet’s individual case.

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Evie Moloney, RCVS

This article has been reviewed and approved by an independent Veterinarian: Evie is a vet surgeon who graduated from the University College Dublin, which is the only university offering the veterinary medicine degree in Ireland. She really enjoys surgery and has also worked as an emergency and critical care vet. She is passionate about sharing education about preventative health care for pets, especially the importance of regular dog and cat teeth brushing at home. She also enjoys helping owners find practical solutions for keeping pets as comfortable as possible while living with conditions such as arthritis. When not working, she enjoys hiking and swimming.

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