Why are dogs so sociable with humans? Find out the answer in this gripping episode of PBS' longest-running - and one of its most notable - series. First up: examining the ties that bind pet owners with their canine companions. Then, in the second half, join comedian John Ritter as he visits with the most adorable of dogs: puppies. This was an interesting documentary which had some cameo appearances by the dogs� ancestors the wolves. I would suggest this film to anyone who likes dogs and/or wolves. The movie also featured some golden retrievers.