Summarize:

Dogs are bred for a specific purpose, whether it be herding or hunting, and can misbehave when these natural instincts are suppressed.   Create an obstacle course in which your dog follows a scent to his favorite treats. Provide him with food puzzle toys, like Kongs, to stimulate his mind. Leave him with plenty of chew toys. These will not only strengthen his jaw and teeth, but also keep him from chewing up your shoes instead. Hire a dog walker or someone to play with your pet while you’re away. Keeping him isolated or at home all day can be detrimental to his emotional well-being and create fear when he finally does come in contact with other people or dogs. But always remember to take your pup’s personality into account so you know what his limits for socializing are.   Take your dog on a walk, to the dog park, or set up play dates with other humans and their dogs. Have a friend, whom your dog knows and trusts, look after your pet once a week to get him used to other people. If your dog has a cautious demeanor, introduce him to one dog at a time, and only if the other dog is calm and won't frighten your pup. This will not only increase his mental stimulation, but also strengthen the bond between you and your pooch by making your expectations for him clear. If you aren’t sure what training would benefit your dog most, contact a Certified Pet Dog Trainer. It’s important to show your dog love and affection, but he is a tribal animal above all else. Your pooch will become confused without structure and consistency in his life, so be sure you stick to your role.    Playtime is only for when he is calm and receptive. Reward your pup with special treats when he has followed your directions. During walks your dog should be next to or behind you. Never behave uneasy or anxious. Because you are the pack leader, these feelings are sure to rub off on your pet. Nervous animals are more likely to be aggressive. Believe it or not, your pup does have self-esteem, and there are things that you, as his owner, can do to keep it up. Praise your dog when he has mastered a new trick, along with other accomplishments. Remember that your tone of voice is the key to communication with your pet; praise for him should sound different than a command
Give your pup a job for when you're gone and he is left alone. Socialize your furry friend. Train your dog. Establish yourself as pack leader and never waiver. Remain calm and assertive around your dog. Maintain your dog’s confidence.