Dogs are natural hunters and they will chase almost anything. With the proper amount of training this can be reduced or at least controlled.
Because dogs are natural hunters and they have an instinct to chase down prey and capture or kill it, they will chase almost anything that runs. Some breeds of dogs are more aggressive than others for example, German Shepherds and Rottweiler’s are natural guard dogs. It is their instinct to chase down, capture and bite their prey.
It is very difficult to get a dog not to chase things that enter or come near their territory.
Predatory aggression, the dogs instinct to chase is triggered by almost any rapid or unexpected movement, such as a jogger, a bicyclist, another dog walking by or by an animal in the yard such as a cat. Even the most gentle of dogs are capable of predatory aggression if its triggered.
The dog must be trained as a puppy not to be aggressive with other animals otherwise you will need the help of a skilled dog trainer to deal with their natural instincts.Columbus Pet Grooming
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Most dogs at least the domesticated ones anyway chase because they think it’s a game. For example, a dog chases a bicyclist, the sight of a moving bicycle stimulates the dog to chase it. If the cyclist continues, most dogs will stop believing they chased the cyclist out of their territory.
Another example is the dog chases a jogger, if the jogger should suddenly stop and challenge the dog, he will learn this is not an acceptable and rewarding activity.
Most dogs chase out of instinct and because they want to play, if the dog becomes overly aggressive towards humans or other animals he will have to undergo some training. If training is required of the dog, this must commence while the dog is still a puppy otherwise it will be extremely difficult and much more expensive to get the required training.