If you're a good owner to your pet, it will never forget you.
As proven by the loyal dog who refused to leave his owner's coffin and which now faithfully visits his grave every day.
Cesur was part of the guard of honour at the funeral of him owner Mehmet Ilhan, when he died aged 79.
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The black-and-tan pup stood solemnly by the side of Mehmet's coffin throughout the ceremony at the Central Mosque in Ohraneli, Turkey, before following it into the cemetery to watch him being buried.
Watch a heartbreaking video of Cesur here...
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Mehmet's son Ali, who has adopted Cesur, said the pooch is struggling to adapt to life without his beloved master.
Ali said: "My father was paralysed for many years and adopted Cesur as a puppy two years ago to keep him company.
"He loved the dog and took very good care of him and I think Cesur is just sad because he is missing him.
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"He wouldn't move away from the coffin, not even an inch, at the funeral and then he followed us to the cemetery and waited until he had been buried.
"Nowadays he visits the grave every day because he can't seem to get used to the absence of my father."
Ali says he takes Cesur for a walk to the cemetery in north-western Turkey's Bursa Province, where he spends hours guarding his late owner's grave.
This isn't the only instance of an animal mourning it's owner's loss...
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Heartbreaking Video Shows Horse Crying At Owner's Funeral
Credit: CEN
A video showing a horse crying at his owner's funeral went viral last week.
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The clip really knows how to stirrup the emotions; you can tell his owner was his mane man.
Wagner de Lima Figueiredo, died in Paraiba, north east Brazil and he and his horse had an especially close relationship. So much so that the horse was brought to his funeral.
During the video, Sereno the horse begins stamping his feet and whinnying loudly before placing his head on the coffin containing his owner.
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The owner was a semi-professional cowboy who died on New Year's Day in a motorbike accident.
A close friend, Francielio Limiera, told the Daily Mail: "It was an unbelievable thing to see the way the horse behaved. If I hadn't been there I wouldn't have believed it myself.
"As we brought the coffin out at the beginning of the funeral, [Sereno] sounded like he was crying and as if he recognised that his owner was finally leaving him. He pounded the ground with his hooves and kept on whinnying. It was very sad."
Some experts believe that horses can be aware of their owner's death and therefore mourn for them.
Featured Image Credit: CEN