I have a red merle she cant take the heat, if we go out she has to stay on the lead or she is f... with in ten min, I have to say it is worrying me abit as I would like to start her road work to make her fit, but she could not take it in this heat, and we do have the summer to come as yet, So to get her fit for the winter is a worry,The only thing I can think off is going out later at night