The temperature at which it is too hot to walk a dog depends on several factors, including breed, age, overall health, humidity, and whether or not there is a breeze. However, experts generally agree that it is safe to take your dog for a walk in temperatures of up to 68°F, while anything over 77°F is considered very risky. Even at temperatures as low as 70°F, dogs can be at risk of developing heatstroke, a high temperature that isn’t caused by a fever. Some sources suggest that if its 85°F or higher outside, it may be too hot for your dog to safely walk outdoors, particularly if your dog is not accustomed to long walks or just started warming up outside. It is important to note that different sizes and breeds of dogs have different tolerances to the heat, and dogs can quickly become overheated, especially when exposed to direct sunlight or in environments with high humidity. Therefore, it is crucial to pay attention to your dog's behavior and signs of overheating, such as excessive panting, drooling, and lethargy, and to provide plenty of water and rest breaks during walks in hot weather.