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Old 03-02-2014, 08:03 PM   #5 (permalink)
gsdsar's Avatar
Join Date: May 2002
Location: Maryland
Posts: 6,477

Black tar stool, is an indication of blood high in the GI tract. Not in the lower intestine, but digested or large intestinal bleeding. I would have him checked for an ulcer.

His aggression could easily be linked to feeling bad. I would ask for a referral to an internal medicine specialist o a vet school. I would get a urine culture and an ultrasound.

Good luck.

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