Although I am personally more of a cat person, I do have a soft spot for dogs, too. Precisely the qualities normally emphasised in Lenormand understandings of the Dog card are those that most appeal. Loyalty, dependability, companionship, a friend.
Even the idea of someone being a known entity is quite positive - you know what to expect of a dog, it's true. Not only that, though, dogs are dependable in the sense that they have long helped humans, both in hunting and in herding.
I love what Will has done with this card! Doesn't this Dog look alert and happy, ready to get involved?