My granddaughter and her family were also here. Her husband, Ty is a policeman and along with his black lab pal Kino, they are the town's K-9 unit. He and the dog went through all the strict training for the K-9 service. Kino lives with the family but they didn't bring him along.
See Kino sneaking into the picture on the right side.
When we got on the topic of dogs chasing cats, Ty said that part of Kino's police training was aversion to cats. He said the first time Kino went after a cat, he got a big jolt from his shock collar and never did it again. (It sounds cruel but I suppose they need to rigidly reinforce it in the dog's mind.)
That reminded me of the picture that's been floating around online for years that shows the cat marching past a row of German Shepherds.
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I love the tension in the shot.