Merton dog owners are being urged to vaccinate their pets against the killer canine disease parvovirus.

The warning comes after the Blue Cross charity saw a surge in cases of the highly infectious disease at its animal hospital in London Victoria.

In the last three months, the hospital has admitted more than 30 dogs with parvovirus, most of them puppies.

Over a third died from the disease, which has no specific cure, and there are concerns the rise in cases could lead to an epidemic.

Victims suffer from vomiting and diarrhoea, which leads to severe dehydration.

It is often fatal in vulnerable young or elderly dogs.

The virus passes easily between unvaccinated dogs and can survive for months in the environment.

Caroline Reay, chief veterinary surgeon at the Blue Cross in Merton High Street, said: "It is heartbreaking to see so many young pets fall victim to this killer disease that can so easily be prevented by a simple injection.

"Anyone who is worried about canine parvovirus and not sure if their dog's vaccinations are up to date should contact their vet as soon as possible.

"Parvovirus is highly infectious and local pets are at risk because of the recent outbreak of cases from south London treated by our emergency team at the Blue Cross animal hospital in Victoria."

Merton residents receiving means-tested benefits or on a state pension can get their puppies and dogs vaccinated at the local Blue Cross animal hospital.

A donation towards the cost will be requested.

Call the hospital on 020 8254 1400 or visit it at 88 to 92 Merton High Street, London SW19 1BD.