how do we stop her biting us and pulling our clothes

Question
penny our lab is 14 fourteen weeks old she has started to bite us and pull our clothes when we try and stop her she really gets nasty i have to put her out the kitchen and away from us till she calms down but it starts over again i am worried she is going to turn out vicious  

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.  One thing you can do at that stage is to knot and wet a piece of cloth.  Then freeze it.  The cooling will sooth the gums.  Only let the puppy have it when you are there to watch it.  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.

Ropes from the pets' store quickly turn to hazardous shreds.   Ones I made
lasted much better.   Go to a hardware or home center that sells rope by the
foot.  Buy 2' of 3/4" poly rope.   Melt the ends, and tie  knots in it.   Get
them as tight as possible, put it in a vise and pound it with a hammer.  Watch
carefully, and be ready to discard when it comes apart.

I recently attended a seminar on dog training.  Most of the 75 dogs there were young Labs.  Even the people that didn't have one at the time, likely would soon.  The trainer liked the yelp and walk away technique for biting.  When our first Lab was 14 weeks old, it was summer time and our kids were wearing tee shirts with the tail out.  Taffy would jump up and hang from the tee shirt tail.  That was in 91, we were way lower on the learning curve then.  It is difficult to walk away with a 20 pound dog hanging on your clothes.  It also can tear the shirt.  The turn your back technique to stop jumping doesn't work well either.  Perhaps the old knee in the chest when they jump up would work along with a ''Bad dog!'' or ''Ut, ut, ut!''.  It is important that she never gets any positive attention for jumping and biting.  Withdrawing all attention to the extent you can should be effective.  You also must turn around and give her positive attention when she stops jumping and biting.