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The group of animals commonly referred to as "fish" is a paraphyletic group of some 30,000-plus described species (www.fishbase.org). That is, it includes all of the descendants of the common ancestor of the vertebrates (subphylum Vertebrata) with the exception of the tetrapods (subclass Tetrapoda–amphibians, reptiles, birds, mammals, totaling around 23,000 species), a fairly significant branch of the subclass Sarcopterygii alongside lungfish and coelacanths.

Perianal fistula is a specific disease of the canine characterized by ulcerating fistulous tracts, often with a malodorous purulent discharge around the anal orifice. The tracts are usually infected and filed with chronic inflammatory tissne. The extremely severe and chronic cases the tracts may extend to the lumen of the rectoanal canal, becoming true fistulas.

The entire urethra is lined with transitional epitheliurn with the exception of a small amount near the tip of the penis or urethral tubercle. Urethral muscle is composed of an inner longitudinal layer of smooth muscle and an outer transverse layer of skeletal muscle that are separated dorsally by a longitudinal raphe.