Before he could react, the creature snapped the branch that he had been holding the mouth open with to bits. He then was swallowed whole. He went down the throat and into the stomach.
There was a bunch of acid in here. In a panic, he flailed around and happened to find the entrance to the small intestine. Using all of his strength, he pried it open and crawled inside.
Once inside, he collapsed from exhaustion. He was pulled at by the villi in the small intestine but slept through the ordeal. It wasn't until he was nearly through the small intestine that he awoke.
As it was still dark, he realized that he was still inside the creature. How long he had been inside the creature's bowel, he had no way of telling. He was suddenly moved into large intestine.
In here, he got covered in dinosaur poop. He had to ride through this all the way to the rectum. Luckily, the rectum was full and he soon heard farts below him.
He was soon pushed out the anus and out the cloaca. He avoided much of the solid waste as he'd been one of the last things pooped out but was still hit by urine as the creature peed.
Luckily, the sharptooth hadn't noticed him. Done emptying out, she left. Littlefoot went to go take a long bath. He was tired of being a lone dinosaur!