I'm going to try to be delicate here - you know I absolutely love dogs. I just don't get it. What doctor in his right mind is going to take the diagnosis of a dog? What benefit is this, really?
I'd like more detail - please forgive me - did your grandmother go to the doctor based on what the dog sniffed - and if so, how did she know what the dog detected?
Do I think it's awesome? Yep. Am I too blind to see the advantage of this? Yes, until such time as we can talk to dogs.
I do believe that animals sense something. We had a cat that never came near me - ever - until AFTER I had my gall bladder removed. For about a month, she insisted on sleeping at the head of my bed. Don't know what that was all about.