make a 28cm-wide cylindrical cage with a trap door in the bottom and camera / light. lower over dog. trap door opens as bottom of cage goes over dog's head.

make a 28cm-wide cylindrical cage with a trap door in the bottom and camera / light. lower over dog. trap door opens as bottom of cage goes over dog's head. keep lowering until cage is on bottom of hole. raise cage. it may pinch the dog's leg but at least it wouldn't be dead.