My 15 months old male BCI ate a large rat on the 24th of July and went into shedding. He shed his skin on 4th of August and did not poop or eat until now. He usually poops 2 or 3 days after shedding.Today i took him out of his enclosure and he started hissing at me and did not stop until i left the room. He never hissed at me before. I am able to feel a small lump down by his vent. But its small to be that large rat he ate. If it was constipation i think that the lump would have been bigger to match the size of the rat that he ate. I soaked him today for an hour in a a barely warm water and what came out was a yellow urine but no poop. Should i take him to the vet?