All dogs are capable of showing aggression when they feel uncomfortable. There isn't really a 'good dog' and an 'aggressive dog'. Signs of aggression can include lunging, growling, snapping, nipping, or biting. Aggression puts people or other animals at risk and suggests your dog is distressed by the situation, so must be addressed.
Here are some of the reasons why aggression happens. During a consultation we work out, based on your dog's history, what the reason is for their behaviour and how to overcome this with a treatment plan.
When dogs are afraid of people, dogs, or a situation and cannot get away from it
When dogs are feeling unwell, sick, or injured & they want to protect themselves
When dogs feel threatened for something they value, such as their territory, food, or a toy
When chasing small furry animals, due to a natural instinct or previous training
When dogs feel confused or frustrated about their choices at the time and from the past
Play fighting is normal, but it can turn into true aggression if a dog's signals are misread