Causes
The bite of an adder (Vipera). More common in spring and summer, in hilly and rural areas. The dog is usually bitten on the muzzle while investigating.
Diagnosis
The clinical signs (a bite with rapid swelling) point towards it. The vet assesses the severity with blood tests.
Treatment
EMERGENCY: keep the animal at rest and calm (movement spreads the venom), do NOT apply tourniquets or try to suck out the venom, and seek help immediately. The vet treats with supportive care, pain control and, depending on the case, antivenom.
Prevention
In spring and summer, prevent the dog from putting its muzzle into bushes and gaps between rocks in hilly areas. Keep it under control in the countryside.

