Smudge is a favourite in our house and this book was a good addition to our collection. My 5 year-old loves the story and really relates to the grumpy day Smudge has, asking for it to be read over and over. She likes that Smudge has many of the same feelings as she does on her own grumpy days, and is comforted and reassured that in the end, Smudge's friend Stripe continues to love and take care of Smudge despite her angry and frustrated outbursts with him. We all have grumpy days from time to time and this book lets little ones know it's okay to have those emotions, and that the grown ups in their lives will love them just the same. Aside from the story, the illustrations are wonderful and fun.