The weather has a direct effect on your pet’s mood and that's why as the temperature rises, some dogs rejoice, while others seek out cool places for rest. Though all dogs are susceptible to hot weather conditions, certain breeds are less heat tolerant than others. Brachycephalic breeds, such as Bulldogs, French Bulldogs, Pugs, Boston Terriers, etc. have difficulty breathing in extreme heat and like to stay in air-conditioned rooms. So, if you own a breed like these, you may experience that your dog is not much active in summer and doesn't like playing.