When a dog threatens a family member at home, it may mean that the dog does not want to be handled in a particular way or that he is guarding something.
Some dogs can feel possessive over certain objects — a toy, a food bowl, or just about anything. My friend’s dog Merlin will grab an abandoned sock and carry it around, but will not let anyone take it from her. Try to grab her sock, and you’ll be rewarded with a growl.
You can help reduce possession aggression over time. If you can start young, you may be able to prevent many possession-related problems.
Food-related aggression is one of the most common possession issues. Food is one of the most valuable things in a dog’s life! Your dog may not want humans or other pets to approach while he’s eating. What can you do? Get your dog used to the idea of your presence at food time. Sit on the floor near the food bowl while he eats. Talk to him, and pat him gently. I’d suggest starting with a gentle touch on the rump — as far away from the food as you can get. Over time, you can work up to touching him on the head while he eats. Put your hand on the bowl to add a special treat — this will teach your dog that human contact with the bowl means something good is coming. You should eventually be able to take the bowl away from while he is eating without a problem.
If your dog is already acting aggressively, you need to move slowly and cautiously. Don’t rush your dog — be patient and loving. Always praise and reward the behaviors you want. Negative reinforcement (like hitting or yelling) may make your dog more fearful. I’m a big believer in positive reinforcement when it comes to training. Make your dog WANT to do a behavior because something good is coming, rather than make him afraid of your wrath.
Aggressive behavior can be dealt with, but it takes time and patience. You may want to talk to your veterinarian, a trainer, an animal behaviorist, or even your local shelter for advice.