Why do dogs chase?

The answer lies within something called internal reinforcement. Dogs inherit instinctive behaviour, for example a dog doesn’t have to learn to lift his leg to pee, he just does it, this is an instinctive action, also known as a “motor pattern”.

Chasing behaviour is part of the inherited predatory hunting sequence. This sequence is genetically “hard wired” into the dog, and prepares it for chasing and catching prey in order to survive.

“External reinforcement” is the way we usually train dogs: we give them a treat or give them a pat when they do the right thing.