Sounds like it may be a good idea...?? maybe? I think because Pits are single coated dogs it may work well. Rottweilers do have a double coat...the undercoat, and the longer hair on top. I do wonder if it will trap the heat putting a shirt on? I do know Rottweiler people that compete with their dogs...and they do use the cooling-vests. They seem to work well. We have always tried to stick to being outside early in the a.m. or later in the evening when the heat is on. Humidity is also really hard on Rottweilers. The air may not be that warm ..but the humidity thick.