How cold does a Jack Russell terrier have to get to die?

Jack Russell Terriers, like most dogs, are vulnerable to extreme cold, especially below freezing temperatures (32°F or 0°C). While individual tolerance varies based on factors like age, health, and coat type, prolonged exposure to temperatures below 20°F (-6°C) can be dangerous and potentially fatal. Hypothermia and frostbite can occur if they are not adequately sheltered from the cold. It's essential to monitor their well-being in cold weather and provide warmth and protection as needed.