Object-guarding starts during puppyhood . Owners may fail to notice their adolescent dog becoming increasingly possessive and protective. Some may actually encourage their puppy's protective displays, thinking they are cute.
It is natural for dogs to protect their possessions. In the wild, a wolf would hardly pop next door to borrow a cup of bones. Domestic dogs quickly learn that once something is gone, it is gone. So it is not surprising to find dogs trying to keep their possessions away from people.
Puppy PartyThere are many considerations when choosing a puppy, including which breed or type, and the optimal age of acquisition. Obviously, you want to choose a dog that is best suited to you and your lifestyle. Rather than listing my preferences, I will discuss some of the more important guidelines.

Dr. Ian Dunbar's book "Before You Get Your Puppy" is a must-read for anyone thinking about getting a puppy. We think it is so important that owners are prepared before they adopt their pup that we are making the entire book available here for free download.
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Even though you think your dog sits fairly reliably, he probably will not sit if he is at a distance. In fact he probably will not sit if there is any variation in the training scenario. If you turn your back on him and ask him to sit, he probably won’t. If you lie on your back and ask him to sit, he probably won’t. If you ask him to sit in heel position as you continue walking, he probably won’t. But don’t worry, your dog is not being disobedient. Rather, like all dogs, he is an extremely fine discriminator and has only learned precisely what you have taught him — to sit if he is right in front of you, or if he is by your side in heel position. So, you need to teach him to sit in every possible situation and especially, if he is at a distance and distracted.
A dog's adolescence is the time when everything starts to fall apart, unless you make a concerted effort to see it through to the stability of adulthood. Your dog's adolescence is a critical time. If you ignore your dog's education now, you will soon find yourself living with an ill-mannered, under-socialized, hyperactive animal. Here are some things to watch for.
Household etiquette may deteriorate over time, especially if you start taking your dog's housetraining and other good behavior for granted. But if you taught your pup well in his earlier months, the drift in household etiquette will be slow until your dog reaches his sunset years, when housetraining especially tends to suffer.
Don't forget to practice in the car. It's the same technique as on the walk. For a couple of days, read the newspaper in the car, having instructed your dog to settle down with a stuffed Kong. Have a short training interlude every minute or so to practice some body-position changes —sit, down, stand, etc. —or place changes — back seat, front seat, seat belt, crate, etc. It is much easier to do this when you are not driving and the car is stationary. Once your dog promptly responds to each request, repeat the exercises with a friend driving. You'll soon find your dog happily responds to your requests when you are driving.

David LetterDog’s List of Things Dogs Cannot Do While Chewing a Chewtoy
- Chew carpets, curtains, cushions, couches, clothes, chair legs, children's toys, electrical cords, and computer disks. Play-bite (or mouth) human hands, arms, legs, and ankles. Play tug o' war with trousers, skirts, and shoe laces.
- Surf kitchen counters. Empty cupboards. Lick butter from the refrigerator. Trash the trash.
- Dig in the yard for escape or enjoyment. (Certainly a dog can dig while holding a chewtoy in his jaws, but if really working on his chewtoy he will have little time for digging holes. And he will not want to bury his chewtoy with the tastiest treats still inside.)
Successful domestic doggy education involves teaching your puppy to train herself through confinement. This prevents mistakes and establishes good habits from the outset. When you are physically or mentally absent, confine your puppy to keep her out of mischief and to help her learn how to behave appropriately.
The more you confine your puppy to her Puppy Playroom and Doggy Den during her first few weeks at home, the more freedom she will enjoy as an adult dog for the rest of her life. The more closely you adhere to the following puppy-confinement program, the sooner your puppy will be housetrained and chewtoy-trained. And, as an added benefit, your puppy will learn to settle down quickly, quietly, calmly, and happily.
When You Are Not at Home
Letting your dog play uninterrupted in the park can be one of the quickest ways to lose control over your adolescent dog. Allow him to play uninterrupted and you'll quickly lose his attention and have no control over him whatsoever. On the other hand, if you integrate training and play, you'll soon develop reliable, off-leash distance control over your dog.
How to Train Your Dog Not to Come When Called
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