Can dogs eat salmon?

Cooked, raw, smoked or canned: the form is the whole answer

Nothing here is about quantity. A dog can eat a generous piece of plain cooked salmon and be fine, and a dog can eat one raw offcut and end up in hospital. That is why the verdict sits at caution rather than moderation.

Why raw salmon can be deadly when cooked salmon is not

Two organisms are involved, not one. Salmon and other salmonids can carry the larvae of a fluke called Nanophyetus salmincola, which sit in the muscle of the fish. The fluke by itself is close to harmless: the Companion Animal Parasite Council notes that infection with N. salmincola alone is not associated with clinical disease.

The danger is what some of those flukes are carrying. A bacterium called Neorickettsia helminthoeca lives inside the fluke, and when your dog swallows raw infected fish, the fluke delivers the bacterium. That causes salmon poisoning disease.

Merck describes it as fever, vomiting and diarrhea, bloody stools, heavy weight loss and dehydration, with generalized lymph node swelling in more than 70% of cases. Untreated, up to 90% of affected dogs die within 7 to 10 days. A milder related illness, Elokomin fluke fever, kills about 10% of untreated dogs.

Heat breaks the chain. The Western College of Veterinary Medicine puts it plainly: fish should be cooked or frozen solid to inactivate the larvae before it is fed to dogs. Once the fillet is cooked through, the mechanism above has nothing left to work with.

Where salmon poisoning disease actually happens

The disease needs a full life cycle in one watershed, including a freshwater snail as the first host. Because the snail and the fluke have a limited range, the distribution of salmon poisoning disease was long thought to be confined to the northern Pacific coast. Merck still describes it as limited in the US to coastal areas of the Pacific Northwest, most prevalent between northern California and Puget Sound, and reaching inland along the rivers salmon migrate up.

That range is not a hard border. Cases have been confirmed in California, Washington, Oregon, Idaho, Canada and Brazil, and Merck notes reports from southern California.

So geography changes the odds, not the rule. A dog in Portland that raids a bin of salmon carcasses is in a different situation from a dog in Ohio that stole a corner of raw supermarket fillet. Neither is a reason to serve raw salmon on purpose, and neither is a reason to skip the phone call if your dog gets a fever afterwards.

What happens after a dog eats infected raw salmon

The hard part of this disease is that nothing happens on the day it matters.

Emergency vet tonight, or a call in the morning?

If your dog ate raw salmon an hour ago and is bright, eating, and behaving normally, that is expected. It is not reassurance. The gap between the meal and the fever is the whole problem with this disease, and it is why owners so often connect the two too late.

The useful move is to make sure your vet knows the date your dog ate raw fish, before your dog is unwell rather than after. Treatment works and it works quickly: Washington State University reports that most dogs show dramatic improvement within two days of starting treatment.

If your dog already has a fever, is vomiting, has stopped eating, or has bloody diarrhea, and there is raw salmon anywhere in the last month, that is a same-day problem. Say “salmon poisoning” on the phone and give the date of the fish. It changes what your vet tests for.

What the vet does about salmon poisoning

Diagnosis usually starts with a fecal sample, because the fluke sheds eggs that can be seen under a microscope. VCA also describes blood work, a needle sample from a swollen lymph node to look for the bacteria directly, and PCR testing for bacterial DNA.

Treatment runs on two tracks, because there are two organisms. Merck lists doxycycline for the bacterial infection alongside praziquantel for the fluke. Dogs that are already dehydrated or bleeding may be admitted for intravenous fluids, anti-nausea and anti-diarrheal medication, and occasionally a transfusion.

Does freezing raw salmon make it safe?

This is the question raw feeders ask, and the veterinary sources do not give one answer.

The Western College of Veterinary Medicine says fish should be cooked or frozen solid before feeding, without naming a duration. The Oregon Veterinary Medical Association gives a number: cook fish thoroughly, or deep-freeze it for a minimum of two weeks. Neither specifies a temperature for a domestic freezer.

Two weeks is the only figure a veterinary source puts on it, so two weeks is the figure to use if you are going to freeze. Cooking is the control every source names, and it is the one that does not depend on how cold your freezer actually runs.

Skin, bones, salt, and what else ends up on the fillet

Skin. Fine cooked and plain, and it is the fattiest part of the fish. Merck lists large amounts of table scraps and other inappropriate food among the common risk factors for pancreatitis in dogs, so a whole crisped skin is a bigger ask of your dog than a strip of it. Raw skin is raw fish and carries the same risk as raw flesh.

Bones. Salmon fillets keep fine pin bones down the center line, and canned salmon often keeps the vertebrae. Run a thumb along the fillet and pull them before you serve it. VCA lists bones among the objects dogs swallow that become gastrointestinal foreign bodies, and says an obstruction compromises the blood supply to the gut, with tissue starting to die if that supply is interrupted for more than a few hours.

Salt. Salt gets blamed for smoked salmon more than it deserves. Merck puts the point where signs of salt toxicosis appear in dogs at 2 to 3 g of salt per kilogram of body weight, with the acute lethal dose around 4 g/kg. Those are doses a stolen slice of lox does not come close to. The real reason to skip cold-smoked salmon is that cold smoking never cooked it.

Seasoning. Merck lists onion and garlic among its food hazards, so a fillet roasted on a bed of either is a different question from a plain one. That is covered in onions and garlic.