Harrowing moment teenager begs for help after her miniature pinscher was mauled ...

Harrowing footage has captured the moment a teenager begs for help after her miniature pinscher was mauled to death by a leadless 'devil' dog in London.

Renata Aladenika, 18, was walking Rocco in Woolwich Common on Sunday when she claims a bullmastiff rushed over, sank its teeth into her dog's neck and shook him 'like a rag doll'.  

The student then filmed the bullmastiff's owner as she dragged her dog away from the scene, while Rocco lay bleeding in the grass and Ms Aladenika sobbed 'he's dying' and 'I don't know what to do.' 

Heartbreaking photographs later captured the devastated pet owner as she said goodbye to her 'best friend' Rocco - whose injuries were so severe he had to be put to sleep. 

Harrowing footage has captured the moment a teenager begs for help after her miniature pinscher was mauled to death by a leadless 'devil' dog in London. Pictured: Renata Aladenika with Rocco

Harrowing footage has captured the moment a teenager begs for help after her miniature pinscher was mauled to death by a leadless 'devil' dog in London. Pictured: Renata Aladenika with Rocco

Ms Aladenika has now shared footage of the aftermath in a bid to unmask the owner who she claims offered to give her a lift to a vets but then fled with her dog.

A GoFundMe page has been set up to help with her £1,300 vet bill. 

Ms Aladenika, from Charlton, south east London, said: 'It felt like this giant devil dog versus our tiny Rocco. 

'He was a tenth of his weight, so he didn't stand a chance. To lose him like this was so traumatic.    

'The dog wasn't on a lead. It was awful, he ran over and grabbed Rocco by the head and started shaking him.

'The owner tried to drag it away by the ear, but it must have been 70kg.

'She apologised and said she would give me a lift to the vet, but when she got into her car she just drove off.

Pictured: The bullmastiff

Pictured: The bullmastiff

Ms Aladenika, 18, was walking Rocco in Woolwich Common on Sunday when she claims a bullmastiff (pictured) rushed over, sank its teeth into her dog's neck and shook him 'like a rag doll'

Heartbreaking photographs captured the devastated pet owner as she said goodbye to her 'best friend' Rocco - whose injuries were so severe he had to be put to sleep

Heartbreaking photographs captured the devastated pet owner as she said goodbye to her 'best friend' Rocco - whose injuries were so severe he had to be put to sleep

'Rocco was my best friend. The house is so empty without him and it feels weird going to sleep without him on my bed.'   

Ms Aladenika explained how she had taken four-year-old Rocco for a half-hour walk at around 8.50pm on Sunday as the weather was still warm in the evening.

The pair had been making their way back home when another woman and the bullmastiff approached from the left.

'The other dog was off the leash so Rocco

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