#9 – American Bulldog
The American Bulldog is a large working breed developed from crossing various other working and bully breeds. They are active, affectionate and make great guard dogs, but their conformation does lead to breathing difficulties and a higher risk of heatstroke.
#10 – Shih Tzu
The Shih Tzu is a very popular companion breed both as a purebred and when crossed with other breeds. They are affectionate, goofy dogs that make wonderful lap dogs. They are a brachycephalic breed and, accompanied by irresponsible breeding, are at risk for a large number of health problems. A higher risk of heatstroke is one of them.
#11 – Chow Chow
The Chow Chow is a medium-sized dog from China, notable for its extremely thick and fluffy coat. Although originally used as a guard dog, the breed can suffer from a multitude of health problems today. Because of its coat, heatstroke should be considered when taking the dogs into warm weather.
#12 – Bullmastiff
The Bullmastiff is a giant breed that appears far more imposing than it actually is. They are known for being deeply loyal but affectionate gentle giants. They are very large and brachycephalic, making them prone to heatstroke and special attention should be taken when working these dogs in hot weather.
