Symptoms

• Besides diarrhea, colitis may be accompanied by blood drops in the stool and mucous surrounding the stool. Inflammation impairs contractions and movement of the colon, preventing adequate absorption of water and nutrients before being expelled. When a dog is suffering from colitis, he usually has diarrhea.
  
  

Bacterial Colitis

• Bacterial colitis, most commonly a form of Giardia, is diagnosed through blood work by a veterinarian. Certain bacteria naturally live in the dog's colon. However, if there is too much bacteria, it can be toxic on the colon mucosa, preventing electrolyte absorption for your dog.
  
  

Treatment

• A dog suffering from bacterial colitis will be given a round of antibiotics to bring bacteria back into balance. Generally bland diets--including rice, boiled chicken and beef--are a good source of nutrients for dogs that will not further irritate the colon. Metronidazole or flagyl are two common dog medicines for colitis.
  
  

Colitis as Early Warning

• Colitis may be an initial symptom of more serious problems in dogs. It can present itself on the onset of intestinal cancers. Lyme disease or blood disorders may also first present themselves with symptoms of colitis. Always consult your veterinarian with any concerns over your dog's health or changes in symptoms.
  
  

Prevention

• Most dogs do not have chronic issues with colitis unless that have other pre-existing health issues. Keep table scraps to a minimum. Make sure any meat, particularly bones, are cooked thoroughly. Prevent your dog from drinking outdoor water sources.