A. What other signs of sickness were present? Bright red blood on the outside of the stool usually indicates hemorrhoids due to chronic constipation: this can be resolved a number of ways. Dark blood indicates bleeding further up the GI tract such as a gastric ulcer etc. has your dog been adequately treated for parasites? Your dog seems young to have these issues. I think we should set up a consult to get to the bottom of this.
A. Typically pets don't improve with major illness no. However that is not to say that he shouldn't still be evaluated and treated for this. Blood in the stool is not something that should go on to see if it improves itself. At the very least a good exam, fecal and appropriate antibiotics (preferably Metronidazole) and probiotics (fortiflora or proviable are #1 choices, over the counter Culturelle can also be used) should be used to get your pets bacterial flora back to normal. Everyday that he goes without proper treatment can increase his chances of dehydration and permanent altering of his GI tract which can predispose him to a chronic GI problem.
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