I could really find little redeeming value here. It's not that I mind a good gassy book - I can laugh and giggle over the tales of toots for ages. But, to me, the story-telling here just felt forced, and there didn't seem to be anything special in the writing. Plus, the illustrations kind of wigged me out.
That said, what I really could not support was the horrible attitude of the father. After the two children bring Walter home from the pound (where nobody wanted him, but they loved him), the family realizes Walter has an aromatic issue. They try to take him to the vet and change his diet (which, I thought was a good idea until they start feeding the dog junk food ...) but when the diet change doesn't work the father decides that the dog is going back to the pound! A) What an awful message for children: even though you can't do anything about an issue you have, you'll still be punished. And, B) no matter how sad this made the children to send Walter away, the father didn't care.
I don't know what message this book was trying to convey, but I think it sent far too many negative messages to make up for whatever redeeming message there may have been. Definitely not impressed.