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especially the heart like you experienced. I mentioned to my psychiatrist that there are times my German Shepherd, who isn't a trained service dog seems to be trying to alert me. I read or hear something that makes me really angry, and even if I don't make a sound, and just start to tighten my muscles, and clench my jaw, my dog comes running sometimes even when he's been in another room, and starts slamming against me, if I am standing, or jumping on me and licking my face, if I am sitting. The doctor said dogs can smell changes in the scents that your body is giving off as your heart races or your BP rises. She warned me never to ignore his signals, and to start petting him to calm myself down. It has helped.