For a striking portrait of a dog exuding high-end fashion with a gangster flair, set up a dimly-lit studio backdrop. Use dramatic lighting to enhance depth and texture, casting shadows that accentuate the dog's features and attire. Dress the dog in stylish gangster-inspired fashion and position them in a commanding stance. Employ a Canon EOS R5 paired with a Canon RF 50mm f/1.2L USM lens, setting the aperture wide open to around f/2.8 for isolation and sharpness. Opt for a shutter speed of 1/125 to 1/250 to freeze motion. Prompt the dog with commands or props to capture a confident, elegant demeanor.