A seal who had been delighting Londoners with its appearances on the banks of the River Thames has been euthanised after a dog attack.

The young common seal, dubbed Freddie Mercury in honour of the late Queen singer, and for his crowd-pleasing antics, was injured by a dog on Sunday.

Freddie was sunbathing on a stretch of river near Barnes, west London, when he was mauled by a dog.

The seal was rescued by passers-by including a veterinarian, who kept him on shore while help arrived.

The British Divers Marine Life Rescue (BDMLR) said in a statement Freddie was taken to South Essex Wildlife Hospital for treatment which included pain relief and scans.

He was found to have a fractured flipper and a dislocated joint, with the hospital saying that consultations with specialist marine and orthopaedic veterinarians revealed Freddie’s prognosis to be “extremely poor”.

“At this stage we believe the only ethical and fair option we have is to end his suffering,” the hospital said in a Facebook post.

The course of action was confirmed by BDMLR, which said: “We are all absolutely gutted to hear about the extent of the injuries Freddie suffered, and highlights yet again the serious problems that can arise when humans and dogs encounter wild animals.

“We hope that his story will go a long way to helping educate people to look up and follow the appropriate guidelines for how to behave respectfully around wild animals and not cause disturbance or worse to them.”

The hospital said “sadly” Freddie was not the only seal it had treated, adding: “Please folks do not go near seals and always, always, keep dogs on leads and under control.”

Common or harbour seals can often be seen in and along the river Thames, with the Zoological Society of London’s Thames Marine Mammal Survey reporting 117 sightings of the mammal this year.

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