Dogs can show aggressive behaviours to help tell us that they are afraid, in pain, or need some space. Depending on when your dog shows these behaviours will help determine the cause of the aggressive behaviour. For instance, if your dog regularly growls when you touch them in a certain place it may be that this is a source of pain, this can particularly be the case if children are being over enthusiastic with their affection! If your dog growls when you approach their bed or their food they are likely to be asking for some space. If your dog growls at specific things, such as one of your children's toys, they may well be afraid of it.