The man in the story has 3 dogs, so the obvious place to go for reference would be my dog. She's a Collie cross something or other that looks a bit like a terrier and completely dominates the Collie genes. Because there is no way this dog looks like a Collie. I think she would be fantastic to model the dogs in the story on because of her eyebrows. She has an incredibly expressive face with those big white bushy eyebrows. The second video, of her eating a carrot, really shows off her brows.
Since she's very old now and doesn't move quite like she used to - just sleeps - I've combed through old videos and photos of her for references from a range of different angles and actions.