Surge in Snake Bites Among Pets Raises Alarm Amid Limited Antivenom Supply in Sweden

During May 2026, Sweden witnessed a sharp 63% rise in snake bites affecting dogs and cats compared to the previous year. This spike has been linked to warmer, sunnier weather encouraging more outdoor activity among pets and their owners, increasing encounters with venomous snakes, specifically the native Scandinavian adder (huggorm).

Marlene Areskog, chief veterinarian at Evidensia animal care, noted that snakes seemed more venomous this spring, with many cases demanding intensive care and antivenom already in April. However, the availability of antivenom is now limited for June due to the unexpectedly high demand earlier in the season. Hospitals have distributed supplies regionally, but shortages may require referral of affected pets to larger facilities.

Most bites were reported on paws and noses—areas particularly vulnerable to venom spread—making bites potentially life-threatening, especially for dogs. Cats have also been increasingly affected, with Agria animal insurance recording 539 snake bite cases in 2025, surpassing the number in dogs. Owners are advised to keep pets leashed and under close supervision in nature and to seek immediate veterinary care if bitten.

The huggorm, recognized by its zigzag pattern, can emerge early in milder springs and is found throughout Sweden. Both pet owners and individuals bitten by these snakes should promptly seek medical or veterinary attention to mitigate serious health risks.