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When exposed to temperatures that are excessively low, bullmastiffs do not perform well. The short coat that they have offers just a small amount of protection against cold weather, and they have a rather poor tolerance for such temperatures.
It is possible for Bullmastiffs to experience pain, hypothermia, and frostbite when temperatures are below freezing (32 degrees Fahrenheit or 0 degrees Celsius). It is essential to provide them with a comfortable shelter and bedding that is insulated and to restrict the amount of time they spend outside when the weather is cold.
The range of temperatures that are most pleasant for bullmastiffs is moderate. An ideal temperature range for this breed would be between 10 and 27 degrees Celsius (50 and 80 degrees Fahrenheit). On the other hand, they are better prepared to deal with temperatures that are relatively chilly than severe heat.
The massive bulk of bullmastiffs, along with their restricted capacity to disperse heat and their short nose, makes them particularly susceptible to hot temperatures. They are susceptible to overheating and heat-related disorders such as heatstroke when temperatures are higher than 80 degrees Fahrenheit (27 degrees Celsius).
Leaving them in a parked vehicle, even for a short length of time, is something that should never be done. It is of the utmost importance to make sure that they have access to shade and lots of fresh water.
