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My name is ***** ***** I’ve been involved professionally with dogs in the health and behavioral fields for over 18 years. It will be my pleasure to work with you today. I'm sorry no other expert chose to answer your question. The short answer is that as long as the amount of blood is small (less than a tablespoon) and red, then it should be ok. Red blood indicates bleeding in the bowels or irritation in the bowels. Black fecal matter would indicate bleeding in the upper digestion tract and possibly be more serious.
You do want to watch for obstructions and peritonitis. You can read about here:
In addition, wood can splinter and puncture the gastrointestinal tract causing peritonitis. Read about that here:
If you notice symptoms such as inability to defecate, vomiting or symptoms of peritonitis, then have him seen again by your vet.
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I just thought I'd check in to see how things are going for you and your dog. Let me know if my answer was helpful.