This is the natural state of the English Bull Terrier. Most people have this image of them being highly aggressive canine fighting machines, but the reality is that they prefer comfortable beds, cuddling up to blankets or preferably people, and sleeping.
Every now and then something miraculous happens and the Bull Terrier will erupt into a highly excited state where it runs at full tilt round and round. Heaven help anyone who gets in the way as its like being hit by a fury anti-tank missile. This is known as the “bully run“. It usually lasts about 2 minutes then the normal state is resumed.