WATER

Please remember that whether you are live tracking or just training it is extremely exhausting for your dog using their olfactory senses. In this hot weather we are having please make sure you carry plenty of water for your tracking hound, (and yourself).
As we know tracking in dry conditions is not ideal anyway but even in the late or early hours it can still be warm enough to exhaust your dog to a point where they need to re-hydrate. 
A point of note is that having a wet nose from drinking will also help open up their nasal passages giving their scent receptors a better chance of working to the their full potential.