The small intestine is followed by the colon as the final component of the digestive system.
The majority of the nutrients in food have already been absorbed by the time it reaches a dog’s colon, but any undigested food that is still present is further broken down by the colon’s huge, natural bacterial population.
There are two forms of colitis in dogs:
Acute colitis refers to a sudden onset of symptoms that typically lasts only a few days. We see this often in dogs, and it usually clears up on its own.
Chronic colitis lasts for longer—from weeks to months. With chronic colitis, your dog will have multiple episodes of symptoms that keep coming and going, or symptoms that simply keep going. Either way, chronic colitis in dogs often requires a medical workup.