On a side note, I always wanted to ask this Wondergirl, but how did your cats get on with the wild sisters?

Mucus is a jelly like substance which can be clear, white, or yellow in coloration. It is produced by the mucous membrane in the large intestine. Mucus is a protective secretion which is also produced by other organs in the body such as the lungs, where it helps to trap any foreign particles that are inhaled. In the intestine, mucus protects the inner lining and helps ease the passage of stool.

Normally your doggie poop contains a small amount of mucus, but poop with visible amounts of mucus can be from a variety of causes. Mucus in the poop is a common symptom of irritable bowel syndrome and ulcerative colitis. A bacterial infection, anal fissure, or a bowel obstruction may also cause excess secretion of mucus.

In Ulcerative Colitis, the mucus membrane of the intestine becomes inflamed and develops ulcers. These ulcers bleed and produce pus and mucus, which may be visible as they are passed in the stool. In case of Irritable Bowel Syndrome, there will be increased mucus production by the lining of the intestine, which is then passed.

Bacterial infections are likely to cause mucus in the poop. A bacterial infection may also be the cause of diarrhea, fever, and abdominal cramps. Some bacterial infections may resolve on their own without treatment, but some cases may be serious and require professional medical help for your pet.

A bowel obstruction is associated with constipation, severe cramps, abdominal tenderness, and vomiting as well as the passage of mucus. Bowel obstructions can be from a variety of causes and in many instances require surgical procedure to resolve the issue.

If your dog is earlier diagnosed with Irritable Bowel Syndrome or Ulcerative Colitis, then mucus in his poop should not be a point to worry. But in case an intestinal obstruction you need to consult a professional for further diagnosis and or treatment.