There are a number of different species of dogs in the world, but how different are they from one another? Kate Humble and Steve Leonard present this programme that features some of the UK's top canine experts showing how varied the different breeds are. Among the topics discussed are how the differences came to be and whether the variety is just with the dogs' physical features or if they extend to other areas, such as the animals' senses and instincts. Also joining `The Wonder of Dogs' is historian Ruth Goodman, who reports from locations across the country to provide viewers with the stories behind some of the most iconic breeds.