Ultra-realistic 3D Golden Retriever, light golden coat, standing on all four legs, natural pose, friendly attentive expression, fluffy fur with realistic texture and subtle color variations, detailed eyes, nose, and paw pads, natural muscle definition, physically accurate materials, high-resolution PBR textures (albedo, roughness, normal, displacement), realistic studio lighting, soft shadows, neutral background, centered composition, clean topology, optimized mesh, 4K textures,