Nipping/biting and jumping

Question
I have a labrador puppy that has progressed from mouthing and nipping hands and arms to jumping up and biting whatever he can get his mouth on.

Initally when he would nip we would yelp and ignore him or place a toy or chew in his mouth. This worked fairly well when he was smaller but now that he has gotten bigger, he jumps up on us and will nip/bite legs, arms, thighs, stomach... basically anything he can reach. We will yelp or say no firmly, turn our back to him and walk away but he usually persists and will jump/bite us from behind...often resulting in some painful nips or torn clothes. Ignoring doesn't seem to curtail the behavior and we usually have to put him in his crate or outside which is occurring more and more as the behavior seems to be happening more frequently especially around our children. Any suggestions would be greatly appreciated. Thanks.

Answer
Consistently is very important in correcting jumping and other problems. Quickly correcting him each and every time he jumps on somebody is very important. He must never get the affection he wants. A number of things have been used. One of the most gentle is to grab his front paws and hold him up. The traditional knee to the chest or step on his paws are fading from use. As part of the the trend away from negative methods, just step backwards leaving his front feet to fall to the floor. After a few tries, the dog may just stand there looking confused.

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 soothe 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, jerk their hand away, and leave.

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. I don't trust any of the consumable chews. The dogs just gnaw them down to a dangerous size too quickly. These problems are the worst with, but not limited to, large, aggressive chewers such as Labs.