When you find yourself trying to remember a show (or any works) that's on the tip of your tongue but just out of reach, come here - the collective brain of the TVTropes community can probably help. Post all the details you can remember (examples help). If you're looking for a trope, head over to Trope Finder. Have general questions about tropes? Visit Ask The Tropers!
What color is the dog? What years were you reading this book, approximately?
Vehicle Based Characterization | Grief Induced Split | Locker Mail^ I mean, what years were you a little boy. Because that can rule out books published after that period.
Vehicle Based Characterization | Grief Induced Split | Locker MailBorn in 2004, I was a young boy up until I became 13 in 2017.
Anyways, I will reiterate some of the details I can remember from the book. There's a scene where the dog tumbles down a grassy hill and becomes dizzy once he reaches the bottom, and another where he's eating sausages while wearing a napkin around his neck.

One of the many children's books I used to have and read as a kid was one where the main character is a shaggy dog. I can recall scenes from the book such as the dog rolling down a hill and getting dizzy, as well as one where the dog eats sausages with a napkin wrapped around his neck, but I can't remember the name of the book nor the dog character. The book, if I recall correctly, was published by Scholastic.