Margo Masse: Do yourself a favor and don't think so much. It gives you premature wrinkles.
Nicole Walker: Everybody says one thing and then does another.
David McCall: You're not dancing.
Nicole Walker: I know.
Nicole Walker: Isn't this the car they stopped making 'cause it, I don't know, blows up or something?
David McCall: Guess that's why I got her.
David McCall: Hey Mr. Walka.
Answer: Not enough information was revealed in the short scene to make any conclusions and there was no concrete evidence that a (dog-related) crime was being committed. There was not even any indication that a dog was present. One might GUESS that David and his friends prepared dogs for illegal dog-fighting or trained dogs to be dangerous, aggressive watch (or "attack") dogs, but there is no proof. "We're here to see a man about a dog" may sound suspicious or shady, but could mean something as innocent as looking for a lost pet. [00:38:36]. There is a second "clue" much later in the movie when Mr. Walker is talking on the phone: "They're running their own cartel and you can't do a goddamn thing about it"? Mr. Walker probably saw some evidence when he broke into their house. While it might be assumed he means a drug cartel, not all cartels are drug-related. But, relating this scene to the earlier one, it appears "We're here to see a man about a dog" is the code for wanting to buy drugs. (The man who answered the door replied, "Does this look like a kennel?") David and his friends/gang appear to have been selling drugs out of their home. [01:15:55].
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