Part 3: Anger/FrustrationI've used this book with K-3rd grade, though the main character is certainly more like 4. Great use of externalizing a feeling, this book teaches deep breathing as a way to manage anger while also showing that anger itself isn't bad.
Needless to say, there are a lot of books to choose from in the area of anger. Top faves, all of which also have a regulation component, are below.
As I mentioned before, this book is gold. For anger, frustration, or disappointment - I love this book. It's also a great segue into self-talk. While the book only really discusses one coping skill (telling yourself "no biggy"), part of its excellence is that students really seem to remember and use this.
(Already mentioned in this post specifically about Julia Cook books)
For my 2nd-4th graders, this is my go-to for talking about using deep breathing when angry. It's a great introduction to glitter/relaxation/mind jars as well. I know some folk get worried about using it because it has the word "meditate" in it, but I personally think it's easy to use the book without really using or talking about meditation. The other thing I love about this book is that one of the things that angers the cow is being teased/made fun of by others, which my students can relate to more than examples in other books.