How come my 2 year old female shih tzu doesn't become pregnant?

Philippines
June 2, 2010 11:53pm CST
I have a 2 year old female shih tzu my son bought her a younger husband more than a year old , but they dont mate, they are on the same cage. one suggest that you train and get a shooter. do i have to do it? any more suggestions .... pls..
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