Also, with an otherwise healthy heart, simply accelerating the heart rate isn't going to cause a heart attack. That's just not how it works.
But if you prefer to believe your dog is a Guardian Angel in disguise, or otherwise anthropomorphic, that's certainly your prerogative.
I remember some wishful thinker posted a video of a dog running in front of a fire truck to a house fire. The FR wishful thinkers insisted the dog was leading the truck to the address. The reality is that the dog was doing what it had always done, viz. run in front of any vehicle to his house. He was playing.
I clearly said in my post that I didn’t believe I was going to have a heart attack and that my dog didn’t save me from one. All I said is that he sensed the abnormal racing of my heart. And no, the dog didn’t CAUSE the anxiety. I woke up as soon as he pounced on the bed and I felt his weight plop on my chest.
I will believe what I want. My dog, that is never allowed on my bed and had never been up on my bed, noticed an aberration in my physiology and took some action during that episode.