Service dogs can smell things humans could never dream of smelling. Paul, who is diagnosed with hypermobile Ehler-Danlos Syndrome, has a service dog that can smell the chemical change in Paul before the paralysis episode takes over his body. Dogs can smell pre-seizure events, low-blood sugar episodes in diabetes, and even cancer. It can be any breed of dog as long as they are good at the work. The book “Doctor Dogs,” by Maria Goodavage is available now.