Danielle Jacobs has Asperger's - a disorder on the autism spectrum - and a video of her being calmed down by a dog has gone viral.

Jacobs posted the video to YouTube and captioned the video:

"This is what having aspergers is like. Please no negative comments this really happened and it's not easy to open myself and share what it's like on a daily basis. This is what's considered a meltdown. Yes Samson is alerting. I trained him to alert to depressive episodes and self harm not both but he alerted. 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."

People with Asperger's are very intelligent, but often suffer from depression, generalized anxiety or obsessive compulsive disorder, according to Asperger's Disorder Homepage. Asperger's is a mild form of autism.