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Originally Posted by dwerten  this sounds like pure blood though - is it OP as colitis is usually yellow jelly type poop with blood in it but this sounds much worse to me  |
That's my thinking, too.
This little guy needs to go to an emergency vet before he goes in to shock. Do not let them pat you on the head and send you home with orders to just watch him. He needs to be observed very, very closely.