Hi Customer (name blocked for privacy),
Rectal bleeding can be a problem in the rectum or the colon. If it happens right after defecating, it may be an anal gland problem. Just bleeding from the rectum without clots may just be a problem in the rectal area such as rectal polyps. You can read about anal gland problems here:
http://www.dr-dan.com/analsac.htm
http://www.thepetcenter.com/wai/analsacs.html
You can read about rectal polyps here:
http://www.petcancer.co.uk/cgi-bin/articles/020.htm
It's also possible your dog may be experiencing a rectal prolapse. You can read about that here.
http://www.peteducation.com/article.cfm?cls=2&cat=1571&articleid=349
Parasites such as worms and protozoan infections such as coccidia and giardia can produce blood in the stool and blood from the rectum after bowel movements. You can read about these here:
http://www.thepetcenter.com/exa/worms.html
http://www.peteducation.com/article.cfm?cls=2&cat=1622&articleid=727
http://www.missionmedvet.com/encyclopedia/giardia_canine.htm
If there is straining to defecate, frequent small stoos, mucus with the stools, blood coating the feces, signs of discomfort such as licking, turning suddently or crying, then most likely the problem is in the rectal area. This would include rectal polyps or prolapse, parassites, colitis, colonic ulcers, hemorrhagic gastoenteritis (HGE) and even cancer. HGE is very serious and life threatening. You can read about it here:
http://www.petplace.com/dogs/hemorrhagic-gastroenteritis-hge/page1.aspx
If the dog is vomiting and refusing to eat along with bloody diarrhea, then the dog should be seen immediately by your vet. Most cases of blood in the stool or bleeding from the rectum is not immediately life threatening if there is no bleeding from other openings, but there are a few that can be. You can read about the various cause of red blood in the stool here:
http://www.petplace.com/dogs/hematochezia-blood-in-stool-in-dogs/page1.aspx
If your dog frequently chews and ingests fabric, itis possible your dog will develop an obstruction which you can read about here:
http://www.petplace.com/dogs/gastric-stomach-foreign-body-in-dogs/page1.aspx
If something was ingested before this started the blood could be caused by inflammation to the intestines as it is moving through your dog's system. I do urge you to have the dog seen in any case so a definite diagnoses can be determined and treatment plan decided on. I hope this information is helpful to you.
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Thanks,
Jane