need help with agresive pup

Question
I just have one more question,you said she'll only get worse with this biting,she has already left an open bite mark on my 3 yr old.when we got her it was from a backyard puppy mill that we didnt realize til we got there,anyhow the lady also sold us the dog with a umbilical hernia.
She told me we could bring her back and give us  a pure bred daschund ,cause she has no money to give back to us.
Just wondering what you would do or recomend in this situation ? I dont want her to really bite my granddaughter any worse ,she lives with us .Or bite us.
Thank you
Dawn




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Followup To
Question -
I have a shitzu/daschund mix pup thats 10 weeks old,shes very agresive ,if she has a toy we cant go near her or she'll bite us,cant go near her food or she'll growl and bite, I thought they where too young to start doing things like this.
We have a crate for her but she barks and barks in it .
I also have tried to start teaching her the basics of sit ,stay etc,and she wont have any part of it.
Can you please help ?
Thank you
 Dawn
Answer -
Most dog trainers are moving toward more positive methods.  I am afraid a few dog may need a little more disipline.  This is not something she will grow out of, but will get worse.  And stick with the obedience.  

Likely you will need stronger corrections.  Give a warning stern "Bad Dog!".
In stubborn cases, I repeat the "Bad dog!" right in its face with the dog on its back. Hold it down until it lifts one back leg to show submission.  Use one
forearm under her jaw to keep her teeth away from your face.  Another very
effective technique if the dog is small enough, is to pick it up with your
hands behind its front shoulders and hold it out with its back to you.  Make
sure it is far enough out it can't fling its head into your face.   Hold it
until it quits struggling and relaxes.  If you can't do either of those, try
the squirt bottle.  Fill it with water and a little vinegar or lemon juice.
Give it a squirt in the face as soon as it misbehaves.  Dogs hate that.  I do
too and only use it in desperation.  Denying it your attention works great
too.  Turn your back, walk off, whatever.   Dogs are very social, and losing
your company is the worst thing that can happen.  The solution to a stubborn
dog is an owner that is even more stubborn.  Don't forget the praise and
petting when she finally yields.

Answer
Young Labs, which I know best, and other puppies tend to very bad about
biting.  You see a litter of them, and all the ones that are awake are biting
another one or themselves.  I am not even sure they realize that when they are
alone, if they quit biting, they would quit being bitten.  At 3 to 4 months
they are getting their adult teeth, and it seems they spend every waking
moment biting or chewing.  I maintain a Lab's favorite chew toy is another
Lab.  Otherwise they settle for any person they can.  They keep hoping to find
one that won't yelp and jerk their hand away, or growl "Bad dog." and clamp
their mouth shut.  Then offer a chew toy.  They keep trying despite hundreds
of corrections.   Another good technique is to quit playing and go away.   Be
sure to praise them when they are playing nice and not biting.

You just have to keep on correcting them, hundreds of times, not dozens.
Provide sturdy, safe toys such as Kongs and Nylabones.  Avoid things they can
chew pieces off and choke on them.  Keep them away from electrical cords.
Crates are essential for most young Labs and other dogs.

The pet stores are full of toys that many dogs will quickly chew up into
pieces they could choke on or cause intestinal blockages.  If you are not
there to watch, stick to sturdy stuff such as Nylabones and Kongs.  Keep a
close eye on chew toys and quickly discard anything that is coming apart in
pieces.  Rawhide is especially bad because it swells after being swallowed.
These problems are the worst with, but not limited to, large, aggressive
chewers such as Labs.

There is both play and aggressive biting.  I hope she stayed, biting her littermates, until at least 6 weeks old.  It helps teach them there are limits. With either, you must instantly correct her each and every time.  You can always give her a timely ''Bad dog!'' or ''Ut, ut, ut!'' reinforcing it with stronger corrections when you can.  It still takes a long time.