Blue cheese and dogs: the mold that ripens it is the problem

Avoid

Blue cheese should be avoided for dogs because the mold used to ripen it can produce compounds linked to tremors, on top of a high fat content.

Not worth offering as normally served.

Avoid blue cheese. It's a mold-ripened cheese, and that mold can produce compounds linked to tremors and other neurological signs. Its fat content adds a separate pancreatitis risk, and it's also high in salt. Unlike a plain hard cheese offered occasionally, blue cheese carries a risk specific to how it's made, not just what it's made from.

Safe form: No part or form of blue cheese is recommended. If the goal is a cheese treat, AKC points to low-fat, plain options instead: "It's best to feed your dog low fat cheeses, like mozzarella, cottage cheese, or soft goat cheese" — plain, unsalted, no herbs or seasoning, in pea-sized amounts kept inside the 10 percent treat allowance.
Unsafe form or part: The entire cheese, including the blue-green veining and the rind. Higher risk with strongly ripened, saltier styles (Roquefort, Gorgonzola, Stilton) and with any piece that has additional mold growth from age. Watch the prepared forms, which are the real-world exposures: blue cheese dressing and dips (cream, oil, and mayonnaise plus onion powder and garlic powder, both Allium toxins), blue cheese crumbles served on wings or salad with onion, blue cheese burgers and steak butter, and buffalo dip. In those the added onion/garlic powder and fat load can matter more than the cheese itself.
Preparation: No preparation makes blue cheese safe to feed. The mold is cultured through the whole paste rather than sitting on the surface, so it cannot be trimmed off, and cooking does not destroy mycotoxins. Do not use blue cheese to hide medication, as a training reward, or as a topper. Keep cheese boards, dressing cups, and wing plates out of counter-surfing range, and bin scraps in a closed container so a dog cannot retrieve moldy dairy from the trash or compost.
Deliberate feeding: Only once the form and amount are clear
Hazard level: 3 of 4

If your dog has already eaten blue cheese

A single small nibble of plain blue cheese most often causes nothing worse than gas, loose stool, or vomiting; withhold further dairy, provide fresh water, and monitor for 24 hours. Call your veterinarian or a poison control line (ASPCA Animal Poison Control 888-426-4435, or Pet Poison Helpline 855-764-7661; both charge a consultation fee) without waiting if any of the following apply: the dog ate a large amount or a whole wedge; the cheese was moldy beyond its normal veining or came out of the trash or compost; the dog is small, a puppy, or has a history of pancreatitis, kidney disease, or heart disease on a sodium-restricted diet; the cheese came as dressing, dip, or a topping that likely contained onion or garlic powder. Treat as an emergency and go in now if you see muscle twitching or tremors, unsteadiness or stumbling, hypersensitivity to touch or sound, seizures, a high temperature, repeated vomiting, or a hunched, painful abdomen with lethargy — Merck lists tremors and seizures among the signs of tremorgenic neuromycotoxicosis after moldy-food ingestion, and pancreatitis from a high-fat binge also needs same-day veterinary care. Do not induce vomiting unless a veterinarian tells you to.

ASPCA Animal Poison Control Center: (888) 426-4435 — 24/7, 365 days a year. A one-time consultation fee applies; the ASPCA does not publish the amount on this page.

Sources: PetMD, merckvetmanual.com, American Kennel Club, ASPCA Animal Poison Control. Evidence grade B+. Last verified 2026-09-07. Dataset 2026.09.

Which form of blue cheese the sources actually cleared

Every form of blue cheese is treated the same way here: avoid it. That includes the classic crumbled wedge and rind, blue cheese dressing and dips, crumbles served on wings or salad, blue cheese burgers or steak butter, and buffalo dip. Prepared versions often add onion or garlic on top, but even a plain crumble carries the same mold-based concern as the wedge it came from, so there is no lower-risk form to reach for instead.

Preparing blue cheese for a dog

There is no preparation step that makes blue cheese safer. The mold is cultured through the whole paste rather than sitting on the surface, so it cannot be trimmed away, and cooking does not destroy the mycotoxins it can produce. That sets it apart from many other dairy entries on this site, where trimming a topping or choosing a plain slice changes the verdict. Keep cheese boards, dressing cups and wing plates out of counter-surfing range, and bin scraps in a closed container rather than an open trash can.

What actually goes wrong

Blue cheese is a mold-ripened product, so the hazard comes from what is in it rather than from cheese as a category. Four stacked risks: (1) Mold metabolites. PetMD's cheese guide, reviewed by Teresa Manucy, DVM, marks blue cheese "No" for dogs and gives the reason as roquefortine, the compound made by the Penicillium culture that creates the blue veining. The Merck Veterinary Manual's page on tremorgenic neuromycotoxicosis in dogs lists roquefortine C among tremorgenic mycotoxins and names ingestion of moldy dairy products as a route by which dogs present with tremors and seizures. (2) Fat. AKC warns cheese is high in fat and can lead to obesity and, in susceptible dogs, pancreatitis; blue cheese sits at the high end. (3) Salt. Roquefort, Gorgonzola, and Stilton are among the saltiest cheeses sold; ASPCA notes excessive salt causes increased thirst and urination and can disturb blood electrolytes. (4) Lactose. ASPCA notes dogs lack significant lactase, so dairy commonly causes diarrhea and digestive upset. SOURCES DISAGREE, and this row takes the more cautious side. PetMD states flatly that blue cheese contains roquefortine and is toxic. Merck is more equivocal about that one compound, stating verbatim: "Although roquefortine C is classified as a tremorgenic mycotoxin, roquefortine C has been shown to be not very toxic after intraperitoneal injection in a mouse, with no tremorgenic signs observed" — the tremor cases Merck describes are more often tied to Penicillium crustosum and penitrems on spoiled food than to table blue cheese. Neither AKC's cheese article nor ASPCA's people-foods list mentions blue cheese at all. Net: this is graded AVOID on the consumer-veterinary source that addresses it directly plus the independent fat/salt/lactose load, not as a confirmed acute neurotoxin at snack-sized doses.

Several risks stack here rather than one following from another. The mold used to ripen blue cheese can produce compounds associated with tremors and other neurological signs, though how reliably a normal serving triggers that effect is genuinely debated among the sources behind this page. Separately, blue cheese sits at the high end for fat, which raises pancreatitis risk, and for salt, among the saltiest cheeses sold. On top of both, most dogs lack enough lactase to digest dairy comfortably, so stomach upset is common even without those other risks.

How much counts as too much

All treats combined should generally stay within 10% of daily calories for a healthy adult dog in ideal body condition; individual needs vary.

The table below is the WSAVA reference allowance, printed as published. It is not a portion of blue cheese: it is the total treat-calorie ceiling that everything given outside meals has to fit inside. Average healthy adult dog in ideal body condition. A veterinary team should set the individual dog's daily energy requirement.

WSAVA reference maximum daily treat calories by dog body weight
Body weight (kg)	Body weight (lb)	Max treat kcal/day
2	4.4	14
4	8.8	24
6	13.2	32
8	17.6	40
10	22	47
15	33.1	64
20	44.1	79
25	55.1	94
30	66.1	108
35	77.2	121
40	88.2	134
45	99.2	146

Source: WSAVA Global Nutrition Committee, Feeding Treats to Your Dog. Retrieved 2026-09-07. Working out how many calories your dog needs in total is a separate question — the dog food calculator handles that side.

What these sources do not settle

The guidance names avoid as the verdict and describes the mold, fat and salt risks in general terms, but it does not give a specific amount known to trigger symptoms, or say how a taste-sized exposure differs from a real serving. It notes that strongly ripened, saltier styles such as Roquefort, Gorgonzola or Stilton carry extra risk without saying by how much. If your dog has already eaten blue cheese, especially more than a small taste, contact your veterinarian rather than waiting to see what happens.

Sources and review

PetMD — PetMD — Can Dogs Eat Cheese? (grade B, retrieved 2026-09-07)
merckvetmanual.com — Source for Blue cheese (grade B+, retrieved 2026-09-07)
American Kennel Club — American Kennel Club — Can Dogs Eat Cheese Safely? (grade B, retrieved 2026-09-07)
ASPCA Animal Poison Control — ASPCA Animal Poison Control — People Foods to Avoid Feeding Your Pets (supports the unsalted requirement; page covers salt and nuts generally, does not name cashews) (grade B, retrieved 2026-09-07)

Verdict last verified 2026-09-07. How this site handles sourcing and corrections is set out in the editorial policy, and every reference the site relies on is listed on the sources page.

This page is reference material, not veterinary advice. A dog with a medical condition, a prescription diet or a suspected ingestion needs a veterinarian or a poison control centre, not a web page.

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