An Animal Exercising Apparatus comprising a treadmill and a detachable cage providing a dog or other animal with indoor exercise. The treadmill provides a parallelepiped platform having a hollow interior base, a raised dish platform having a dish, and a conveyor pulley system located within the interior base. The conveyor pulley system provides a continuous conveyor belt disposed over, around and in direct contact with first rollers and a second roller rotatably attached to opposite ends of the interior base, and a motor assembly for rotating the first rollers, thereby causing the conveyor belt to rotate around the first and second rollers. The detachable cage having a door with a latch prevents escape from or invasion by another animal into the treadmill and provides for easy cleaning. The dish allows an animal to drink or eat while exercising.