Warning after dogs bitten by snakes on Strensall Common, near York.
Adders have been spotted at Strensall Common and have come into contact with dogs when they venture into the grass.
Jane Manley, a director at Happy Pets Yorkshire dog walkers, said she was walking a five-year-old cocker spaniel near the reserve early on the morning of April 25 when it was bitten on the nose by an adder.
The director, who has lived in Strensall for 25 years, said she was also aware of two other cases where dogs had been bitten by adders in recent weeks.