This is a cute book based on the PBS children's show "Martha Speaks". In the book Martha meets a new naughty dog and learns that a little praise goes a long way.
Actual title: Martha Walks the Dog, by Susan Meddaugh
Very good message (you get what you expect of others -- and how you speak to them) but the images can be too scary for a small child. I was so startled by the image of "the bully" dog that I stopped reading the book then and there. It shows the dog as practically rabid and his super angry body fills the entire page.