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A dog crack can either be a dog's butthole, or a human's deformed butthole.

A dog crack usually happens at birth and causes poop to be lumpy, small in size, and sometimes causes worms since the person has a dog crack.

The person cannot perform anal sex because her/his butthole is too small for the job. They can only do it in the front.

The person's dog crack can attract other dogs. If a dog sniffs or tries to hump the person's butthole, or anything else a dog does to another's butthole, then that is perfectly normal.
There are so many dogs chasing after Smarly because she has a dog crack, and they all want it.
by slipperydick December 13, 2011
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