"Tyrannosaurus Tex" by Betty G. Birney (author), John O'Brien (illustrator)

Young Pete and Cookie are among a group of cowboys who befriend a giant beast in a ten-thousand-gallon hat who roars a cheerful "Howdee" and helps himself to breakfast--beans, pot, and all.

First Edition. Published in 1994. Dust jacket shows some wear, but the book is otherwise in good condition.