Why raw fish can be toxic
Thiaminase in raw fish destroys vitamin B1, causing a metabolic crisis.
The enzyme is especially high in salmon, trout and carp that pets may eat after a catch.
Owners often think raw fish is healthy and miss the tiny white flakes on the fur.
Why speed matters
Delaying care significantly worsens outcomes. Some signs appear hours or days later, so "looks fine right now" is not a reason to wait.
Symptoms of raw-fish-thiamine-deficiency poisoning
- loss of appetite within a day of eating raw fish
- the pet appears unsteady and may wobble on hind legs by the evening
- the eyes look cloudy or the pupil is dilated, indicating vision loss
- rapid breathing and increased heart rate develop in 24-48 hours
- muscle twitching that can progress to full seizures
- the pet becomes very weak and may collapse
What to do right now
- call your vet urgently, mention raw fish consumption
- bring a sample of the fish or describe the type eaten
- start giving thiamine supplement if your vet advises, usually via injection
- do not give any more raw fish or fish bones
- keep the pet warm and monitor breathing until you can get to the clinic
Sources & further reading
- ASPCA Animal Poison Control — pet poison database & dosage references
- Pet Poison Helpline — toxicology triage guidelines
- Merck Veterinary Manual — toxicology monographs
- Vets Now (UK) — emergency toxicosis guidance
Other poisonings with overlapping signs
- Safe and Toxic Flowers for Dogs and Cats at Home — another common emergency
- Lead paint chip ingestion in dogs and cats — another common emergency
- Hyacinth Bulb Poisoning in Dogs and Cats — another common emergency
Owners also ask
- My 30 kg dog chewed lily leaves in the garden yesterday and now has diarrhoea — is that an allergy or poisoning?
- My nursing cat licked a few flakes of lead paint off a windowsill — could it affect her kittens?
Frequently asked questions
Is Raw fish thiamine deficiency in dogs and cats poisonous to a dog or cat?
Thiaminase in raw fish destroys vitamin B1, causing a metabolic crisis.
What are the symptoms of raw-fish-thiamine-deficiency poisoning?
loss of appetite within a day of eating raw fish; the pet appears unsteady and may wobble on hind legs by the evening; the eyes look cloudy or the pupil is dilated, indicating vision loss; rapid breathing and increased heart rate develop in 24-48 hours
What should I do if my pet ate Raw fish thiamine deficiency in dogs and cats?
call your vet urgently, mention raw fish consumption bring a sample of the fish or describe the type eaten start giving thiamine supplement if your vet advises, usually via injection
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