Ahem.. I guess you're asking tihs just for fun, aren't you? I actually don't even think it's physically possible.
i am not sure but i would hope you wouldnt! that would be an awkward dog... i could also see a size differential being potentially harmful to the mother. but then again, im not an expert!
Saint Bernard with a Chihuahau you are joking right... Just look at the size difference. I'm a teen and I know it's wrong to breed an inexperienced male with an inexperienced female never mind a massive dog and the smallest dogs ever!!!