dog breeding whelping

Question
QUESTION: I just bred my mineature schnauzer how can I know for sure that she will become pregnant.... I know she was in heat & I had left her there w/the male for the whole day in which she mated like 5 times what is the percentage that she is pregnant & how soon will I be able to tell??....... Also how would I know around how many puppies she will have, her mom had 7 puppies & I know that the male just had a liter of puppies 6 months ago & they had 8 puppies....

ANSWER: The female decides the number of pups as she is born with all the eggs she is going to have.  Her body releases those eggs sparingly.

It is unnecessary to do multiple breeding in one day as it's extremely hard on the male and can be damaging for a female.  You could breed her a hundred times in one day, but if she's not ovulating it won't make a lick of difference.  

If you caught the female when she was ovulating, then chances are good that you will have a litter.

---------- FOLLOW-UP ----------

QUESTION: I was told that the more times they mate, the more puppies they can have? Also I was told that puppy liters can have more than one dad?

Answer
Were you told that by somebody who knew what they were talking about ...or was she an old wife?

True: Litters can have more than one sire
False: The more they do it, the more puppies you are going to have.

A male can release 10 million sperm a go. So the more your male releases his sperm without resting, the lower the quality (like the shallow end of the gene pool).

A male needs the millions of sperm because it take millions of sperm to get that one in there.  Sperm is very determined but not real smart.  It will attempt to penetrate just about any large round object, including air bubbles, red blood cells or take a wrong turn and end up elsewhere.

The female has only the number of eggs she has, what she has is what she has.  She may release one, two or half a dozen.  THAT is where the number of pups come from.