You quickly decide that if you two want to escape from the Arcanine's belly before it digests you into mush, the only thing you can do is crawl out through it's intestines. It seems like a good plan, so you quickly tell the other Eevee. She is unsure, and tells you to go first.
So, already feeling the effects of the digestion, you crawl over to the opening to the Arcanine's intestinal tract. It is shut tightly, so you get to work pawing and trying to open the small hole. Unfortunatley, your efforts get you nowhere. After 20 minutes, you feel like you cannot continue. You look back to the other Eevee, to see that she is already unconsious, and taking the full toll of the stomach acids. Finally, you black out as well.
Outside, the Arcanine lets out a loud burp as it feels it's two snacks stop struggling. It's stomach groans and gurgles loudly as it relaxes and digests the two bodies.