"Well, you see," the Arcanine began "I recently had lunch. Actually, it was a while ago. An unfortunate meal crossed my path and ended up in my stomach. There's nothing left, though, except for whatever is left, that is." The Arcanine grinned hungrily. "But enough explaining; you'll just have to see for yourself." With that, the Arcanine opened it's mouth wide, revealing it's sharp teeth and fleshy maw.
The Arcanine moved it's head down to you, covering you in it's hot breath. Finally, with a single bite, it lifts you up off the ground and into it's mouth. Inside, you're swished around with it's tongue for a bit, before being moved to it's throat. You desparatley try to crawl your way out, but it's tongue and mouth carry you to it's throat. Then, it's tonsils press against you as the Arcanine's uvula drags across your face. Now drenched in saliva, you shut your eyes. When you open them, however, you are staring down a fleshy tube, traveling up which are deafening gurgles and sloshes. The Arcanine swallows with one powerful gulp, and you are moved down the esophagus.
Squeezed tightly, the Arcanine easily brings you into it's stomach. You fall face first into an acidic soup of blood and rotting flesh. You franticaly swim to the surface, but not before catching a glimpse of a few bones sitting at the bottom. When you break the surface, you see the muscular stomach walls churning powerfully, creating a storm of waves in the stomach.
Finally, you evaluate the situation. The Arcanine, which was hungry, had eaten you. You were now in it's belly, where it would digest you with the rest of it's food. But, what could you do to escape?
