Battery
ToxicA swallowed battery is never a wait-and-see. A button cell stuck in the esophagus generates hydroxide and can burn tissue in as little as two hours, and a chewed alkaline cell leaks caustic material into the mouth. Do not induce vomiting. Call now.
This food guide has not been reviewed by a veterinarian. It summarises general information from sources and should not be used to decide whether a food is suitable for an individual dog or to assess an emergency.
Check before feeding
Do not offer as a treat
There is no recommended treat portion for this hazardous item. If swallowed, contact a vet with the amount, time and product details. Do not induce vomiting yourself.
Signs and health concerns
This list includes both observable signs and conditions identified through examination or testing. It cannot establish the cause or whether an exposure is safe.
- Drooling
- Mouth pain
- Pawing at the mouth
- Vomiting
- Difficulty swallowing
- Loss of appetite
- Abdominal pain
- Lethargy
- Blocked oesophagus
- Gastrointestinal perforation
- Intestinal blockage
- Collapse
More about this food
A battery is one of the few household objects where suspicion alone justifies an emergency visit. Three separate injuries can happen at once.
The first is electrical. A button or coin lithium cell such as a CR2032 lodged in the esophagus drives a current across its surface, generating hydroxide -- a strong alkali -- at the negative pole. The National Capital Poison Center warns that "severe damage can occur in just 2 hours." This happens even when the battery is intact and has not leaked. Alkaline burns liquefy tissue as they go, so the result can be esophageal perforation, or a stricture months later. That is why the time of ingestion is itself a piece of emergency information.
The second is leakage. When a dog punctures a cylindrical alkaline cell -- AA, AAA, C, D, a 9-volt -- Pet Poison Helpline notes that the leaking material causes "corrosive injury to the mouth and other body tissues." The signs they list are drooling, oral pain and pawing at the mouth, and they add that ulcers may not appear for hours after ingestion. A dog that looks fine in the first ten minutes is not a dog that is safe.
The third is obstruction. Once a battery reaches the stomach or intestine it is a foreign body. Merck's guidance is that failure to pass within 36-48 hours, serial radiographs showing no movement, or worsening clinical signs all call for surgical removal. Repeated vomiting, anorexia, a guarded belly and no stool are the signs at that stage.
What to do right now: find a matching battery and its packaging, write down the type (CR2032, AA, lithium, alkaline), the number, the time and your dog's weight, and call your veterinarian or the nearest 24-hour emergency clinic. You can also reach the ASPCA Animal Poison Control Center at (888) 426-4435 or Pet Poison Helpline at (855) 764-7661, both of which charge a consultation fee and will give your vet a case number. Do not induce vomiting -- caustic material coming back up burns the esophagus a second time, and a lodged cell can be aspirated. Do not give milk or oil or rinse the mouth on your own. The clinic will radiograph first, and a battery in the esophagus comes out by endoscopy immediately. The usual sources are TV and streaming remotes, key fobs, AirTags and trackers, bathroom and kitchen scales, LED tea lights, hearing aids, thermometers, musical greeting cards, and light-up kids' toys. Check that the screw-down battery doors on your dog's reachable devices are actually screwed down.
Frequently asked questions
- My dog swallowed a button battery but seems completely fine.
- That quiet window is the dangerous part. A cell lodged in the esophagus can cause severe burns within two hours, and Pet Poison Helpline notes ulcers may not show for hours. Call your vet or an emergency clinic now rather than watching.
- Can I just wait for the battery to pass in the stool?
- No. Damage continues while it sits in the esophagus, and lower down it can obstruct. Merck advises surgical removal if a foreign body fails to pass within 36-48 hours or stops moving on serial radiographs, so it needs an X-ray first.
- Should I make my dog throw it up to get it out faster?
- No. Vomiting brings caustic material back across the esophagus and a lodged battery can end up in the airway. Whether to decontaminate at all is a veterinary decision, and Pet Poison Helpline specifically says not to induce vomiting here.