Hi Nate, I wouldn't recommend leaving a bully outside alone for any length of time in the heat. Time outside should be kept to no more than 15 or 20 minutes, when its hot outside. Bullies do not tolerate the heat really well, and they can overheat and get heat stroke really quickly. Even temperatures in the 70 to 75 degree range can cause your bully to overheat, or when its humid. On hot days, they should only go out for quick potty breaks during the day, and then back inside to the AC. Walks should be done in the early mornings and in the evenings when it's cooler. Bronco would be safer and more comfortable in a crate inside the house, or placed in a confined area or room, while you are at work.