TL;DR: Most oxygen absorber packets contain a small amount of iron that is unlikely to cause serious poisoning in dogs, but you should monitor for stomach upset and have a photo of the packet ready for your vet.
What is inside the oxygen absorber packet my dog ate?
Oxygen absorber packets are those small, square sachets often found in food packaging like beef jerky, dried fruit, or pet treats. Their primary ingredient is iron powder. When exposed to air, the iron oxidizes (rusts), which removes oxygen from the package to keep the food fresh. These are distinct from silica gel packets, which are used to absorb moisture.
Is it an emergency if my dog swallowed an oxygen absorber?
- The urgency level for consuming a single oxygen absorber is generally low.
- While iron is toxic in large quantities, the amount in a standard food-grade packet is typically not enough to cause systemic poisoning in most dogs.
- The most common side effect is mild gastrointestinal upset, such as vomiting or diarrhea.
- In very small dog breeds, the plastic packet itself may pose a minor choking hazard or cause a localized blockage.
Why should I take a photo of the packet for my veterinarian?
- A photo helps your veterinarian or poison control specialist identify the specific brand and size of the packet.
- There are many types of desiccant and preservative packets; identification is necessary to determine the exact ingredients.
- A photo allows professionals to calculate the exact amount of iron ingested relative to your dog's body weight for a more accurate risk assessment.
Clinical Context (Merck Veterinary Manual)
If a dog has ingested an oxygen absorber packet, it is important to determine the contents, particularly the quantity of elemental iron. For elemental iron ingestion at >20 mg/kg, emesis should be induced, and GI protectants administered, as activated charcoal does not bind iron well. Further treatment and monitoring are necessary if the ingestion is >60 mg/kg. Milk of magnesia (magnesium hydroxide; 5-30 mL once or twice daily) can be given to complex with iron and decrease its absorption. Serum iron levels and total serum iron binding capacity should be checked at 3 hours and again at 8-10 hours post-exposure. Chelation therapy should be considered if serum iron is >300 mcg/dL with clinical signs (e.g., repeated vomiting, shock) or greater than the total iron binding capacity. Note that clinical signs, with or without blood, may be followed by hypovolemic shock, depression, fever, acidosis, and liver failure 12-24 hours later, often with a period of apparent recovery in between. Oliguria and anuria secondary to shock-induced renal failure may also occur.
Chapter: Toxicology, Emergency
Source: The Merck Veterinary Manual, 11th Edition (Page 3003)