a slip mating, i dont want to sound to graphic but does the dog have to swell up before you can say its a slip mating?
the dog did penetrate her but was only there for about 20 seconds and he didnt swell is the any chance this would be enough for her to be in whelp?
many thanks

Yes ther is a chance. The ejaculate of a dog is passed in three stages. The first stage of clear fluid is virtually sperm free. The second stage is richest in sperm, and is released immediately after thrusting. 3rd stage is mainly fluid