When there are children living in a house, the management of aggression is not good enough. Even resource guarding behaviors have to be changed rather than managed. In a university research paper the following was found. (Note that 93% of the dogs that had bitten had been trained.)
Records of bites to 111 children were examined. Children <6 years old were most commonly bitten in association with resource guarding (44%), whereas older children were most commonly bitten in association with territory guarding (23%). Similarly, food guarding was the most common circumstance for bites to familiar children (42%) and territory guarding for bites to unfamiliar children (53%). Behavioral screening of the 103 dogs examined revealed resource guarding (61%) and discipline measures (59%) as the most common stimuli for aggression. Anxiety screens revealed abnormalities in 77% of dogs. Potential contributory medical conditions were identified/suspected in 50% of dogs. When history before presentation was known, 66% of dogs had never previously bitten a child, and 19% had never bitten any human. Most dogs (93%) were neutered, and 66% of owners had taken their dogs to obedience training classes.
If you are living with a dog that growls at you if you try to take something from it, remove it from a piece of furniture or approach its food bowl then you need to seek professional help. Find a professional who is not only a dog trainer but also a dog behavior counselor.
Contact your Local DogSmith, DogSmiths are expertly trained to deal with all types of training problems and dog behavioral issues. The techniques employed are different than teaching a dog a new behavior.