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Bethany Fletcher, 11, from Nuneaton, Warwickshire found it difficult to go to the shops with the family until the arrival of eight-year-old Quartz, due to her autism. The golden retriever can sense when Bethany is feeling stressed and is able to calm down immediately by laying across her legs
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Until recently, a trip to the supermarket with her mother would have been out of the question for Bethany Fletcher. The 11-year-old, from Nuneaton, Warwickshire, has severe autism and she finds the crowds, bright lights and repetitive beeping of the tills unbearable.

Since Bethany was a toddler, such trips often occur in meltdowns, leaving her mother Teresa, 49, and father Steve, 48, exasperated.

In moments of extreme distress, Bethany attempts to pull out the eyebrow hairs or, more distressingly, the teeth.

Bethany Fletcher, 11, from Nuneaton, Warwickshire found it difficult to go to the shops with the family until the arrival of eight-year-old Quartz, due to her autism. The golden retriever can sense when Bethany is feeling stressed and is able to calm down immediately by laying across her legs

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Bethany Fletcher, 11, from Nuneaton, Warwickshire found it difficult to go to the shops with the family until the arrival of eight-year-old Quartz, due to her autism. The golden retriever can sense when Bethany is feeling stressed and is able to calm down immediately by laying across her legs

But today, Bethany is standing in line, a picture of calm at the local branch of Sainsbury’s. Beside her is a golden retriever with conker-colored eyes – and Bethany remains calm as she slowly pats her furry companion's head.

Meet eight-year-old Quartz, one of 7,000 so-called medical assistance dogs who are employed to help disabled or unwell Britons reclaim their freedom and, in some cases, keep them alive.

Bethany's canine companion, who arrived following an application to the charity Dogs For Good six years ago, eases her daily anxiety, teaches her how to share, and even helps her cross the road safely. "Before we got Quartz, leaving the house with Bethany was hard," says Teresa. "If she heard a loud noise she would panic, let's go or your hand and go running off. It was really dangerous if we were next to busy roads. "

Quartz was selected especially due to its calm, unflappable yet strong and sturdy nature. Most medical assistance dogs are labradors or labrador crosses as they are typically unstartled by sudden noises or movements.

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Bethany's complex needs meant Teresa was often forced to stay indoors with her, leaving Steve to lead a "separate life" with their son. "If we didn't have Quartz, I honestly think Steve and I would have separated," Teresa says. "But Quartz keeps Bethany calm, so we can all get out as a family."

When the dog arrived in the family home, Bethany, then aged four, fell instantly in love. Teresa says: "Dogs For Good brought Quartz to our house and they hit it off straight away. They played hide-and-seek in the garden. We immediately saw a calmer side to her and it's leg like that ever since. "

Quartz's special jacket is connected to a long strap which, when fastened around Bethany's waist, stops running into oncoming traffic. When they approach a road, Quartz will only cross when Teresa tugs slightly on his lead, preventing Bethany from moving. "Now we love to go shopping, and she coped with the crowds at Disney On Ice, which would have been unthinkable before," Teresa says.

The skills of medical assistance dogs have developed exponentially since the introduction of guide dogs for the blind and deaf in the 1930s.

Recently, psychologists found that simply petting animals could ease the psychological symptoms of myriad mental health problems. Just last week, TV presenter Ulrika Jonsson credited her two English bulldogs for helping her recovery from depression following the breakdown of her marriage.

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But emotional support is just one health benefit. Dogs' acute sense of smell can now be trained to detect, and help prevent, fatal epileptic and diabetic attacks, and triggers for people with allergies.

Even more remarkably, the latest research shows that dogs can even spot signs of cancer in blood – a medical advancement yet to be cracked by cancer experts. At least 55 medical assistance dogs have already been allocated to Britons at risk of sudden seasons.

From a labrador that sniffed out breast cancer, to the retriever who collects her disabled owner's post, here are some of Britain's life-saving canines …

The labrador with a nose for danger

David Rudkin, pictured, from Thatcham, Berkshire, has type 1 diabetes and his dog Beau, a labrador, retriever cross can warn him if he is about to suffer a seizure

David Rudkin, pictured, from Thatcham, Berkshire, has type 1 diabetes and his dog Beau, a labrador, retriever cross can warn him if he is about to suffer a seizure

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David Rudkin, pictured, from Thatcham, Berkshire, has type 1 diabetes and his dog Beau, a labrador, retriever cross can warn him if he is about to suffer a seizure

Dogs are believed to have a sense of smell that is 40 times more sensitive than that of a human. Now scientists at the country's leading medical dog training center are harnessing this power by teaching them to predict an oncoming type 1 diabetic attack in their owners.

When blood sugar levels reach a dangerous low, the brain signals for the release of a substance called isoprene. This has a specific odor that can be detected in sufferers breath – but it is too faint for a human to smell. Dogs, however, can pick it up.

They are taught to respond to a certain behavior, such as barking or licking their owner's hand. Similarly, dogs can also be trained to sniff out molecules called ketones in the breath – a sign that blood sugar is too high.

David Rudkin, 16-year-old, is one young patient to benefit. When the schoolboy notices his labrador-retriever-cross Beau stop suddenly, prick his ears and tilt his head, he knows exactly what the dog is trying to tell him.

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The teenager, from Berkshire, suffers with type 1 diabetes, and must keep an eagle eye on his blood sugar levels at all times. If they fall too low, hey risks suffering a season which causes unconsciousness or vomiting. The seizure could prove fatal. Avoiding attacks can be simple: consuming something sugary brings levels back into line. Just last month, Beau sprang into action as the pair traveled on the train home after a shopping trip, nudging his knee with his nose. "Then he puts his chin on my legs and licked my knee. It was obvious that he was trying to tell me something, "David remembers.

A finger-prick check revealed that Beau, adopted by the family 18 months ago, was correct – he'd detected the telltale isoprene in David's breath. Immediately, David took a swig or full-sugar cola, preventing a devastating collapse.

Just last month, Beau sprang into action as the pair traveled on the train home after a shopping trip, nudging his knee with his nose. "Then he puts his chin on my legs and licked my knee. It was obvious that he was trying to tell me something, "David remembers. A finger-prick check revealed that Beau, adopted by the family 18 months ago, was correct - he'd detected the telltale isoprene in David's breath. Immediately, David took a swig or full-sugar cola, preventing a devastating collapse

Just last month, Beau sprang into action as the pair traveled on the train home after a shopping trip, nudging his knee with his nose. "Then he puts his chin on my legs and licked my knee. It was obvious that he was trying to tell me something, "David remembers. A finger-prick check revealed that Beau, adopted by the family 18 months ago, was correct - he'd detected the telltale isoprene in David's breath. Immediately, David took a swig or full-sugar cola, preventing a devastating collapse

Just last month, Beau sprang into action as the pair traveled on the train home after a shopping trip, nudging his knee with his nose. "Then he puts his chin on my legs and licked my knee. It was obvious that he was trying to tell me something, "David remembers. A finger-prick check revealed that Beau, adopted by the family 18 months ago, was correct – he'd detected the telltale isoprene in David's breath. Immediately, David took a swig or full-sugar cola, preventing a devastating collapse

Prior to Beau’s arrival, David suffered weekly attacks. And during stressful periods, such as school exams, they could increase to three or four times a day.

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"For the first couple of years after he was diagnosed aged eight, David drags into my room so I could manage his blood sugar levels through the night," says his mother Julie, 49.

"He didn't have sleepovers and I couldn't imagine him going to university." Now the teenager is looking ahead to A-levels and then going to university, where he would like to study maths or medicine – with Beau by his side.

It doesn't take Beau to school, so relies on regular finger-prick tests. But at weekends, his faithful pet rarely leaves his side.

In the 18 months that the family have, Beau, David did not collapse once

In the 18 months that the family have, Beau, David did not collapse once

In the 18 months that the family have, Beau, David did not collapse once

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David says: "The other day my friends and I were at Nando's and Beau was sitting under the table. He's leaping up so suddenly that he's banged his head on the table. My friends said, "What's wrong with your dog?" He put his chin on my leg and stared at me intently. I knew to check my levels. They were high, probably because I just did, so I used my finger-prick device and insulin pump to regular them. "

In the 18 months that the family have, Beau, David did not collapse once.

Studies have also found that dogs can detect a smell in a person's sweat shortly before they suffer an epileptic seizure. Although scientists are unsure as to the exact compound, a study published in the journal Scientific Reports earlier this year found that some dogs could predict epileptic seizures 50 minutes before they occurred.

Medical assistance dogs are also available for those with severe allergies – they are trained to detect microscopic traces or nuts and warn their owner by barking.

Sniffing out the deadliest disease

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More pioneering research into life-saving abilities or dogs comes courtesy of the charity Medical Detection Dogs.

Since the launch of charity in 2008, collaborations with five British hospitals have brought about startling findings.

A 2013 study with Buckinghamshire Healthcare NHS Trust showed that dogs could have been trained to detect participants' breast cancer before a lump had grown.

Dr. Claire Guest, a psychologist and founder of charity, was just one of the lucky participants.

"I had bone training my labrador, Daisy, to very reliably pick up prostate cancer from urine samples since she was eight weeks old, as part of another ongoing trial for charity," she says. "Then, one day in 2009, she ground to behave differently. She kept nudging my chest and staring at me. "

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Remembering Daisy's detection training, Dr Guest checked the body and discovered a small, raised bump on one of her breasts.

"Doctors eventually found a very deep-seated breast cancer very early on," she says. "Daisy had no formal training for breast cancer, but she didn't warn me. I might not be here today."

The charity is currently involved in other dog training trials to detect prostate, kidney and bladder cancer. And previous small studies indicate that dogs may be able to trump modern medicine when it comes to diagnosing some cancers. For decades, experts have been working to develop a simple blood test to spot lung cancer. But where doctors have so far failed, dogs have succeeded.

A recent US study found that specially trained beagles could sniff out lung cancers in samples of human blood with a 97 per cent degree of accuracy.

According to another Italian study, dogs can spot urine markers or prostate cancer 60 per cent more accurately than traditional methods of testing.

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Canines are trained at the Medical Detection Dogs headquarters in Milton Keynes, using samples of human scent which contain compounds given off during the development of various diseases.

Dr Guest says: "Initially there was a huge amount of skepticism but the evidence keeps on coming. Dogs will save thousands of lives in the future. "

"She brings me my post and slippers"

For the past 15 years, the first hour of Dorothy Scott's day has been a struggle. Decades of suffering with multiple sclerosis has left its barely able to move its limbs. But recently, thanks to Vixen, a labrador cross, the morning routine has become just a little easier

For the past 15 years, the first hour of Dorothy Scott's day has been a struggle. Decades of suffering with multiple sclerosis has left its barely able to move its limbs. But recently, thanks to Vixen, a labrador cross, the morning routine has become just a little easier

For the past 15 years, the first hour of Dorothy Scott's day has been a struggle. Decades of suffering with multiple sclerosis has left its barely able to move its limbs. But recently, thanks to Vixen, a labrador cross, the morning routine has become just a little easier

For the past 15 years, the first hour of Dorothy Scott's day has been a struggle. Decades of suffering with multiple sclerosis has left its barely able to move its limbs. But recently, thanks to Vixen, a labrador cross, the morning routine has become just a little easier.

Shortly after Dorothy's alarm sounds at 9am, Vixen arrives at her bedroom, armed with that morning's post and Dorothy's slippers clutched in her mouth.

"Seeing that face, I can't fail to wake up happy," says Dorothy, a former administration assistant at York University. "She brings me post and packages and helps to load and unload the washing machine."

When out shopping – previously a painful, tiresome task – Vixen's strong jaw can take hold or hard-to-reach items on bottom shelves.

Vixen accompanies Dorothy wherever she goes. "Whether it's to events, to meetings, to social occasions or simply to visit the library, and of course we have our daily walk together," she says. "The psychological benefits are unquantifiable and difficult to describe."

For 11-year-old Bethany, there is no doubt that the four-legged friend has provided an emotional boost.

"Autism is an invisible disability. Before Quartz, we'd get a lot of judgmental comments from strangers, "says her mum Teresa.

"Now people ask Bethany questions about him, which really helped with her language."

And if Bethany is upset, Quartz senses something isn't right and bolts over, resting his chin on her lap. "It brings her anxiety levels down," says Teresa.

"Loud noises make her really anxious but Quartz will stay by her side. Our lives have changed beyond belief. "

  • Medical Detection Dogs relies on public donations. To donate, visit medicaldetectiondogs.org.uk.

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