Because the penis swells up inside the female dog's vagina, while the female dog's vagina mussels hold the penis in, this is called a "tie", with ordinary dogs DO NOT pull them apart injure them both.
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This process is called tying. On a wolf penis, there is a knot that expands when the penis is in the vagina of the female. This ties the two together so that they cannot pull apart before the process of reproduction is complete. It ensures that the female will be pregnant.
Canines' mating procedure is only part done when the dog tries to dismount the female. Her organ clamps down on his until the process is done. Getting 'stuck' is the way it is supposed to work!