Hey guys I'm babysitting this rainbow boa for my friend because he couldnt get it to eat (and it hasn't been kept in the greatest conditions). I also gave it better conditions and got it eating every 7 days without refusing a meal. I know the bulge could be a mouse but I'm nervous because it has yet to poop and it's stomach has orangey yellow stuff all over the bottom. Does anyone have any idea what this could be? I am gonna tell him he needs to take it to the vet soon if you guys think it's serious.

Thanks,
Alex