"The length of the ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits." - Genesis 6:15
So the Ark was between 450 and 550 feet long, 75 to 92 feet wide, 45 to 55 inches high. I think asking how the dinosaurs, and all the other animals for that matter, fit into the Ark is a valid question.
Where did you get 45-55 inches high?