A walker was left in hospital for a week after being mauled by a dog in Buxton, a court heard.
Edna Salt admitted one charge of owning a dangerous dog, after her black and white border collie, Jeff, bit Gerald Crutchley on Waterswallows Road on June 8.
High Peak magistrates heard on Monday that Mr Crutchley was victim to an “unprovoked” attack when walking past Waterswallows Farm, where the defendant lives.
Prosecutor Jennifer Fitzgerald said: “The dog approached him, ran passed him, turned and bit his left lower leg and calf hard and immediately ran off over the road.
“He became aware of a woman following it behind and said: ‘Have you seen what your dog has done to me?’ The defendant ignored him. It was bleeding through his socks and footwear.”
Salt, 69, did not assist Mr Crutchley, said she did not have a bandage when he asked and walked off down the road.
The court heard a passer by stopped her car, wrapped his leg in her scarf and phoned an ambulance, which transferred him to Stepping Hill Hospital.
The victim suffered several puncture wounds and a large flap of skin was left hanging off his shin, requiring a skin graft.
Ms Fitzgerald said the “unpleasant” incident had left Mr Crutchley “livid”, as it was not the first time the dog had bitten anyone and been reported to the police.
In September 2012, a man required hospital treatment after Jeff bit him, leaving him with a gash and three puncture wounds, and in November 2013 the dog bit a second man, both on Waterswallows Road.
The first incident was dealt with by means of restorative justice and the second, by means of advice, whereby Salt was instructed to keep her dog on a leash and in a muzzle in public.
When interviewed by police, Salt said Jeff was a working cattle dog and she did not want him putting down.
Annis Rowlands, defending, said her client had been left “distressed”, “upset” and “ashamed” by the case.
She said due to her paranoid schizophrenia, Salt found it difficult to talk to strangers, which is why she did not assist Mr Crutchley.
Ms Rowland continued: “Jeff is eight or nine years old and is missing a number of teeth. He’s a key part of their business. As any farmer know, a good working dog is worth his weight in gold.”
Chairman of the bench Gerry Tootell adjourned the case for sentencing on September 22 and to determine whether a destruction order should be imposed.