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  Well, I can see you two didn't get any answers but out of the other 40 odd people who read this thread, I bet they got a good laugh. 
 No, it doesn't hurt them to swell so big and yes, it is normal. If you don't need the diaper, I wouldn't put it on her. Let her clean herself. Her twat will not go back to the size it was before she came in heat. Also, if you noticed her teats, they are bigger than they were before she came in heat and they also will not go back to their original size. After they have puppies their twats do not go back to original size either. The swelling is indeed so that the male may enter.
 
 Sorry you didn't get answered earlier. Usually the breeders would have caught your post. I haven't been on the net for two days but you have your answer now. Next time if you don't get an answer just type the word "Bump" into a reply box and it will go back to the top of the list of threads. Sylvia
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