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Small dogs have large penises relative to their body size. While there are individual variations, the penises of Jack Russell terriers are typically about 5 inches (about 13 cm) in length when fully erect. This is the length from the bulbus glandis to the tip. The bulbus glandis is an erectile tissue structure that swells significantly to lock the male's member inside the female during mating.

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jeik

Lvl 3
1d ago

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