This is not uncommon in pampered and over-fed dogs, and may be partial or complete. It usually shows as an opening at the sides of the anus .extending upwards to the gut, where it can be seen; but in some cases there is no external opening. It is caused by constipation, when the hardened feces abrade the surface in its expulsion, or neglected piles, resulting in ulceration; or fistula of the anus may come from a wound inflicted on the part.

Symptoms Of Internal Fistula

The dog drags himself along the ground, and the voided matter is highly offensive and often. covered or streaked with blood and matter. The treatment should be left to the veterinary surgeon, who will lay the sinus open and apply remedies to set up healthy action and close it up.