Several types of Medium-sized dogs:

Hunting dogs (sporting breeds):
Pointers: French Pointer, Hungarian Pointer, English Pointer, Brittany Spaniel, Pont Audemer Spaniel, English Setter, etc.
Hounds: Basset hounds, Beagle, Foxhound, Greyhound, etc.
Spaniels: Cocker Spaniel, Springer Spaniel, etc.

Sheepdogs: Bearded Collie, Picard Sheepdog, Pyrenean Sheepdog, Border Collie, Scottish Collie, Puli, Australian Sheepdog, etc.

Dogs brimming with energy: Historically medium-sized dogs were bred for their energy and their physical ability to work outdoors. Because of their morphology and their abilities, they
can perform brief intense efforts while also being fast runners. Their courageous, enterprising nature and their very well-developed sense of smell make them great working dogs.

Exercise is essential: Nowadays, medium-sized dogs have adapted to a wide variety of lifestyles - from working farm dogs to household pets or even city life. To keep them healthy it is essential to take them out frequently so that they can expand energy.