Would like to hear the results myself.
You know, blood can also come from running hard. Mostly in hounds though. Since most of them are open on trail(barking) they tend to bite the tongue. Sometimes it gets bad, and blood is everywhere. We always check the dogs over real good after a chase for anything. Still there are times when nothing shows for days. Then a scratch from a claw swipe may appear, or a lump from a good hit starts to form. These lumps an get scary. The swell up badly sometimes to the point of popping. Then a pin size hole can turn to a half dollar in no time. Dog is off duty for weeks.
If I see blood in the stool. I wil first take into account the running time. Then after a day or two I still see it will worm the dog. If after 5-7 days I still see it or have other symptoms earlier then off to the vet. Other symptoms may be lethargy, glazed eyes, not wanting to hunt, not eating, and trouble getting up or moving.
Hounds, especially bear hounds, take a real beating in the field. Jumping the gun early, running to the vet gets very costly.
Steve