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At first I thought this might be an issue because of ‘penile spines’ that are found on the penis of certain mammals like cats.
Canines however don’t have penile spines.
Canines do have a ‘BULBUS GLANDIS’ at the base of their penis.
>”Male canids have a bulbus glandis at the base of their penises.”
>”During coitus the bulbus glandis swells up and results in a 'tie' (the male and female dogs being tied together)”
>”When the male achieves penetration....during this time that the male's penis expands and it is important that the bulbus gland is far enough inside for the female to be able to trap it.”