Andy, it depends upon how long there's been blood in Woody's poo. A one time event may result from passing something abrasive through the rectum or perhaps Woody's anal gland(s) are abscessed and hemorrhagic. Simple abrasive trauma should heal in 24 hours; abscessed anal glands are evaucated, flushed with an antimicrobial solution and then packed with an antimicrobial ointment. If this is a regular event, however, a significantly inflamed or ulcerated colon (colitis) is the usual cause and Woody's vet would need to investigate the cause and treat appropriately. In that case, intestinal parasites (hookworm, whipworm, Giardia, e.g.), infections (bacterial, viral), and inflammatory disorders are important differential diagnoses.
Please respond with further questions or concerns if you wish.
Is he otherwise well - eating, active, normal form to the stool?
Thank you. Any stressor - heat included - can induce a colitis; this would be difficult to confirm, however. I don't hear of an urgency here and so continuing to "watchful wait" for a few more days is reasonable. We have to remember that these dogs often improve in spite of us! Please continue our conversation if you wish.
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