Congratulations on getting so far with Beauregard and I hope all goes well tomorrow. Will you have some help in holding the carrier while you get him in? Perhaps you already do this but when I have a difficult cat to get into a carrier, I put it on end so the cat is gently dropped in hind end first. A few have managed to hang onto the edge and I've had to wrestle them back, but most are so shocked that they just slide in.

Blood in the stool for all the ferals and strays I've dealt with have always meant giardia; I hope that's all it is for Beau.