The only thing that I know of about that is parvo, but I'm pretty sure that it's normally runny if that's the case.
She went a regular poo and no blood in it. Then 2 minutes later had a little more to releave and it was small stool with bright red blood in it. She does straign at times to poo although plenty does come out. No tar like or smell out of the norm.Define "Blood in stool". Are we talking about some reddish blood in a mucusy stool? Or, are we talking about very soft stools that are tary and almost black from the high concentration of blood in it (these also have a smell that you won't soon forget).
Is the stool completely normal except for the blood? Is it frank red blood? No straining? Has he gotten into anything recently? Have you tried feeding a bland diet of hamburger/rice to see if it helped?
Personally, i am pretty low key on these things (but i didnt used to be!!). As long as EVERYTHING is normal otherwise and it isnt getting worse then i would let it go for a couple days. If it is not better then i would run a stool sample into the vet. Metronitazole is a very common drug and very helpful for stools.
As long as its red blood and not black blood then that is good. Red blood means it is coming from the lower bowe on the way outl. Black blood means intestional bleeding which is not good.