There is no doubt the documentary was interesting and did give a great insight into dogs and how they have evolved from predatory wolves to man's best friend. There was a lot of how guide/service dogs are selected and trained and as it was presented it was good. However I don't know if I saw an advert or a trailer that led me to believe it would be something else but as another review stated exactly the same disappointment I'm sure I must have. I thought it was going to be a documentary helping me explain why my dog does particular things and how I can communicate better with him. So for example it said dogs had developed the ability to look at their owners with "puppy eyes" by showing the whites of their eyes. But never expanded on why they would do this, what they were hoping to achieve and what they were trying to communicate. It said a service dog that barked wouldn't pass the test because restaurants wouldn't stand for it but never explained what different types of barking meant and how to interpret them to know my dog better. It was an interesting documentary if you want to know how service dogs are trained but not if you want to know if your dog's trying to tell you something.