(The following is from 'The Phrase Finder')
Meaning - Back up one's talk with action.SM found this young man today...
Origin - Walk the walk' is almost always said in combination with 'talk the talk', for example, "if you’re going to talk the talk, you’ve got to walk the walk", or "walk it like you talk it".
This is a 20th century American alternative to various old sayings which epitomise the notion that 'talk is cheap', for example 'actions speak louder than words' and 'practice what you preach'.
The context for the use of any of these expressions is in response to what is seen as empty boasting. People who are accused of such are said (in the USA) to 'talk a good game' or (in the UK) to be 'all mouth and no trousers'.
He's been wandering around the neighborhood for the past day or so. He came up to SM and laid his head against SM's leg.
A Pointer/Lab mix I think. Around 2 years old (clean teeth). Amazing temperament. No aggression that I've seen and Casey (aka Pig) can bring out the aggression in any dog with her constant need to play.