Dogs really are man's best friend, and this heartwarming footage is proof.
A woman with Asperger's Syndrome filmed herself during an emotional episode in which she repeatedly hit herself in the head.
Seeing that his owner, Danielle Jacobs, was visibly upset, Samson the service dog came to the rescue and tried to stop her from inflicting any harm.
Jacobs revealed on YouTube: "This is what having Asperger's is like... This really happened and it's not easy to open myself and share what it's like on a daily basis."
She said that she had trained her dog to "alert to depressive episodes and self harm", but not both.
However he had still alerted to his owner's "meltdown", and helped to calm and comfort Jacobs by nudging her with his head and putting his paws on her arms so she couldn't harm herself.
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"I trained him to alert to depressive episodes and self harm, not both, but he alerted," she wrote.
"It appears the response is late but it's actually supposed to be as I'm coming out of the meltdown as I tend to have a panic attack after."
Unsurprisingly, the video has since been viewed more than 800,000 times.
[H/T Mummy Pages]