Dogs just know when something is going on when a person needs help and other times also. Last August I had surgery for a umbilical hernia, it was a one day surgery. Being that I would not be able to bend over to even tie my own shoes for a week and other things I was not going to be able to do I stayed at my sisters house for a week. Earlier that morning she had taken me to the hospital for the surgery and when we came home that night her dog Duke a shepard mix came up to me when I went inside when we got to her house, leaned up against me as I was standing and started crying. He knew something was different and that I was in pain.