Automatic dog back scratcher system and method of using same

An automatic dog back scratcher system that scratches a dog, comprising:

• a frame assembly;
• a movable arm assembly supported by the frame assembly and including a movable finger assembly;
• a treat dispenser assembly, comprising a treat dispensing tube configured to receive dog treats, a plate with a treat dispensing hole that the dog treats fall through, and a motor associated therewith that the controller causes the treat dispensing tube to move with the dog treats therein relative to the treat dispensing hole to cause treats to slide along the plate and fall through the treat dispensing hole for dispensing to the dog;
• a camera;
• a motion sensor;
• a housing covering the frame assembly and treat dispenser, wherein the movable arm assembly extends outward from the housing, wherein the housing is mountable on a wall to elevate the automatic dog back scratcher system above the ground;
• a controller configured to sense motion of an object via the motion sensor, determine the object in motion is a dog via the camera, based on determining the object in motion is a dog, dispense a treat via the treat dispenser assembly to attract the dog to a location adjacent to the automatic dog back scratcher system, and then operate the movable arm assembly to move the movable arm assembly adjacent to the dog and scratch the dog with the movable finger assembly;
• wherein when the treat dispenser dispenses the treat to the dog, the treat falls to a location on the ground that is adjacent and beneath the movable finger assembly, such that when the dog approaches the treat, the movable finger assembly is above and adjacent to the dog's back;
• wherein the movable arm assembly includes an upper arm member, a lower arm member, and a hand assembly that includes the movable finger assembly, the lower arm member including a first end that is coupled to the hand assembly and a second end opposite to the first end, a shoulder joint with a shoulder joint motor that moves the upper arm member relative to the frame assembly, an elbow joint with an elbow joint motor that moves the lower arm member relative to the upper arm member, and a lower arm member motor disposed adjacent to the second end of the lower arm member, the lower arm member motor associated with the movable finger assembly to impart motion to the movable finger assembly to scratch the dog, the hand assembly includes a rotation finger joint, an upper part including an upper attachment member above the rotation finger joint, a lower part including a lower attachment member below the rotation finger joint, the lower arm member includes an upper tendon coupling the lower arm motor to the upper part of the hand assembly, a lower tendon coupling the lower arm motor to the lower part of the hand assembly, whereby rotation of the lower arm motor in one direction causes the upper tendon to pull more on the upper part of the hand assembly than the lower tendon pulls on the lower part of the hand assembly, causing the finger assembly to move upward, and rotation of the lower arm motor in an opposite direction causes the lower tendon to pull more on the lower part of the hand assembly than the upper tendon pulls on the upper part of the hand assembly, causing the finger assembly to move downward.