What are the common symptoms of salmon poisoning?

Common symptoms include lethargy, drowsiness, decreased appetite, repeated vomiting, and diarrhea; some animals may develop fever or neurological signs. If symptoms are pronounced or persistent, seek veterinary evaluation.

What tests will the vet perform during the visit?

The vet will typically perform a physical examination, blood and urine tests, and an abdominal ultrasound; PCR or advanced imaging may be used if needed to confirm the cause.

What can I do at home to help with diagnosis and treatment?

Record the onset time and progression of symptoms, photograph any vomit or leftover food, bring a fresh stool or vomit sample if possible, and compile a list of all medications for the vet's reference.

Can this condition spread to other pets or people?

The risk depends on the source of infection. Certain fish-associated pathogens may pose a transmission risk to other animals; discuss with your vet and follow recommended isolation and hygiene measures.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Salmon Poisoning in Dogs & Cats: Symptoms, Diagnosis & Care [2025]

A potentially fatal rickettsial infection transmitted by eating raw fish

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: AVMA, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate emergency care

•Continuous seizures with inability to regain consciousness
•Unable to drink water with obvious signs of dehydration
•Persistent heavy vomiting or bloody stools

Schedule a clinic visit soon (within 24–72 hours)

•Noticeably decreased energy and reduced appetite for more than one day
•Repeated vomiting for more than twelve hours with no improvement
•Persistent diarrhea with mucus or blood in the stool

01What symptoms indicate something is wrong?

Salmon poisoning typically presents with neurological and gastrointestinal signs, including lethargy, vomiting, diarrhea, and appetite loss; some animals develop fever or neurological symptoms. Early observation helps determine whether veterinary care is needed.

Lethargy, drowsiness, or noticeably reduced energy
Repeated vomiting, possibly of food or bile
Diarrhea, changes in stool consistency or frequency, occasionally bloody
Loss of appetite or rapid weight loss
May be accompanied by fever or elevated body temperature on touch
Some animals may develop tremors, seizures, or disorientation

Seek emergency care immediately if you notice the following symptoms:

⚠️ Continuous seizures or loss of consciousness
⚠️ Inability to drink water or signs of significant dehydration
⚠️ Persistent heavy vomiting or bloody stools

02How to assess abnormalities at home: key observations and emergency criteria

Systematic home monitoring — recording symptoms, frequency, and changes, and collecting samples and photos — helps the vet determine the cause and prioritise treatment more quickly.

Note the time when changes in alertness or energy levels began
Track and record the time and frequency of each vomiting or diarrhea episode
Photograph the diarrhea or vomit, any suspected fish, and leftover food
Weigh your pet daily or estimate weight changes to track any trend
If possible, measure and record body temperature with the time of measurement
If symptoms worsen, bring your records and collected samples to the vet

03How will the vet diagnose the condition? Common diagnostic tests

Upon arrival, the vet will perform tests to confirm the cause and assess complications, including basic blood work and imaging; molecular testing may be used to assist diagnosis if necessary.

Full physical examination and abdominal palpation to assess pain and dehydration

Blood tests

assessing organ function, electrolytes, and infection markers

Urinalysis

evaluating kidney function and dehydration-related changes

Abdominal ultrasound to assess intestinal and lymph node changes

PCR or other molecular testing to confirm the pathogen (if available)

Advanced imaging (CT/MRI) or specialist referral if needed

04Post-diagnosis care: medications, dietary adjustments, and home care guide

Treatment is primarily supportive, with medications and follow-up testing adjusted based on results; return visits and re-checks help confirm recovery and prevent complications.

Follow the vet's instructions for medications and supportive treatment, and adhere to dosing directions
Fluid and electrolyte support to correct dehydration and maintain normal physiological function
Temporary dietary adjustments; gradually reintroduce normal food while monitoring tolerance
Schedule follow-up visits as directed for blood tests and monitoring of clinical signs
Repeat PCR or imaging if needed to evaluate disease progression and treatment response
Ongoing follow-up is recommended — schedule continued assessments at the specialist or original clinic

05What to prepare before the vet visit: key information to help the vet diagnose quickly

Note the time symptoms first appeared, how they have progressed, and the current condition

List the frequency, timing, and contents of each vomiting and diarrhea episode

Photograph any suspected salmon, leftover food, and vomit for reference

Compile a list of all current medications, supplements, and vaccination history

If possible, bring a fresh stool or vomit sample for on-site testing

Prepare any video footage and book an appointment at a clinic with PCR testing capability

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.