anus in dogs

Orifice at the opposite end of an animal's digestive tract from the mouth. Its function is to expel feces, unwanted semi-solid matter produced during digestion, which, depending on the type of animal, may be one or more of: matter which the animal cannot digest, such as bones; food material after all the nutrients have been extracted, for example cellulose or lignin; ingested matter which would be toxic if it remained in the digestive tract; and dead or excess gut bacteria and other endosymbionts. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the anus is

Orifice at the opposite end of an animal's digestive tract from the mouth. Its function is to expel feces, unwanted semi-solid matter produced during digestion, which, depending on the type of animal, may be one or more of: matter which the animal cannot digest, such as bones; food material after all the nutrients have been extracted, for example cellulose or lignin; ingested matter which would be toxic if it remained in the digestive tract; and dead or excess gut bacteria and other endosymbionts. The atlas records it as a organ at the organ scale in the dog.

Where the anus is

It sits within the digestive system. Only the system is known. The position shown carries almost no spatial information.

What the anus connects to

The atlas records 7 typed relationships for it, across 6 kinds of connection. part of digestive tract.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the anus. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as anal opening, anal orifice, opening of terminal part of digestive tract and proctodeum. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001245, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

Questions

Where is the anus?

It sits within the digestive system. Only the system is known. The position shown carries almost no spatial information.

What does the anus connect to?

Part of: digestive tract.

Is the anus the same in other species?

This page describes the dog. The human record of the same structure sits beside it on /compare, over one shared model rather than two atlases built separately.