Use the uploaded reference video as a strict motion and scene template. Keep the entire background, stage, lighting, camera angle, framing, floor reflections, color grading, and all background dancers exactly unchanged. The background dancers must perform the exact original choreography with identical timing, spacing, gestures, poses, and movement throughout the entire video. Only replace the front-most dancing cat with the user-uploaded pet. Preserve the pet’s exact identity, appearance, fur, body proportions, face, and natural features. Transfer the original front cat’s choreography onto the new pet with extremely high motion consistency. The replacement pet must follow the original dance routine beat-for-beat and frame-by-frame, matching the original pet’s body direction, head turns, paw movements, body bends, weight shifts, steps, pauses, and transitions as closely as physically possible. Synchronize every movement precisely to the original music and choreography timing. The pet must start, stop, change direction, and hit every major dance pose at exactly the same moments as the reference video. Do not create new choreography, improvisation, freestyle movement, extra gestures, exaggerated reactions, or additional actions. Do not add any movement that does not exist in the reference video. Preserve the original composition and visual hierarchy: the replacement pet remains in the exact same foreground position, scale, orientation, and screen space as the original front pet. Keep the background dancers fully visible behind it and unchanged. Maintain consistent contact with the floor, realistic shadows, reflections, lighting, and physical interaction with the environment. The final result should look like the original video with only one change: the front dancing pet has been replaced by the uploaded pet. Everything else must remain visually and temporally locked to the reference. Negative constraints: no camera movement, no background changes, no changes to background dancers, no new dancers, no new objects, no costume changes, no scene transitions, no altered lighting, no altered music timing, no extra actions, no improvisation, no random limb movements, no exaggerated motion, no body deformation, no duplicated limbs, no floating, no sliding, no identity drift.