I'm a bit worried about my new foster Murphy. He has not eaten anything or drank anything all night (I caged him alone) and he had poop that was pure liquid. I would have thought it was pee if not the brown color all over the blankets and on the windowsill outside the cage (projectile poop?!?!) He seems so languid too.

Any ideas? He was treated for roundworm, and cleared for other things... but it seems they missed something.