A two-year-old boy received serious facial injuries when he was attacked by a dog in Lincolnshire.
The caravan park where a dog attacked the child
Officers were called to an address at Baythorpe Caravan Site in Skegness on Tuesday morning.
The boy was first taken to Boston's Pilgrim Hospital but was transferred to Leicester Royal Infirmary for specialist treatment.
Police said the dog, believed to be a Staffordshire bull terrier, belonged to a relative of the toddler.
Officers said it appeared the child, who was with his mother, was visiting his grandparents at the caravan park.
Kept in kennels
The boy was undergoing treatment at the royal infirmary for a "nasty bite". His condition was unknown.
A police spokeswoman said the dog had been examined by a vet and was being kept in kennels.
The vet identified the dog as a terrier but further advice was needed from a dog expert.
The spokeswoman said: "We need to investigate the circumstances of the attack before taking a decision on whether to have the dog destroyed."
She added there might have been an element of provocation which would be taken into account.