Maybe its a sign?! I think dogs so sense it in some people.. Although when my lab was a puppy she ran straight up to a man in the park in a wheelchair and she jump straight on his lap, I felt so bad! I think she picked up on him liking her because he wouldnt put her down after lol He said it made his day seeing a beautiful lab puppy. He said it reminded him of his lab pup he had when he was younger I think my lab would be such a good therapy dog but she isn't very good at listening to commands! She tends to have selective hearing!