What is the temperature an English Mastiff must live by to survive?

English Mastiffs can generally thrive in temperatures ranging from 20°F to 80°F (-6°C to 27°C). They are sensitive to extreme heat due to their large size and heavy coats, so temperatures above 80°F can be dangerous without proper hydration and shade. In colder conditions, they may need shelter, especially if temperatures drop significantly below freezing. Always monitor their comfort level and adjust living conditions accordingly.