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A few french fries will not poison a dog. The potato is fine cooked; the concern is the salt, the frying oil, and any seasoning salt. A stray fry is a low-risk treat, while a regular share of a large fries is an unnecessary salt and fat load.
Check French Fries for your dog
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Why French Fries needs caution
Cooked potato is not toxic to dogs, so fries are a salt, fat, and oil issue rather than a poisoning one. The frying oil and salt are what upset stomachs and, in quantity, strain a dog.
Signs to watch for
Increased thirst, upset stomach, vomiting or loose stool
What to do next
Keep it to a couple of plain fries at most, offer water, and call your vet for large or heavily salted amounts or a small dog.
One or two plain fries are usually low-risk for a healthy dog. The concern grows with quantity and with heavily salted or seasoned fries, and small dogs feel the salt sooner.
Can I treat this at home?
A couple of plain fries for a healthy dog is generally fine to watch at home, with water available.
When should I call the vet?
A large amount, heavily seasoned fries, a small dog, or signs of extreme thirst, vomiting, or an upset stomach that does not settle.
•ASPCA APCC, people foods to avoid feeding your pets (salt; fatty foods)
Compiled from veterinary poison-control and medical reference sources, including the ASPCA Animal Poison Control Center, the Pet Poison Helpline, and the Merck Veterinary Manual. This is general educational information, not a diagnosis or a substitute for examination by your veterinarian. DogSafe's severity ratings are our own assessment, calculated from published guidance and your dog's weight. In an emergency, call ASPCA Animal Poison Control at 888-426-4435 or the Pet Poison Helpline at 855-764-7661.