Shazza36, I know exactly what you mean, we are having the same problem with Red. We even bought him a paddling pool yesterday because we thought he might use it to cool down, but he wouldnt go in it,he just kept barking and biting at it and ended up popping it !!!
He's not eating much either just drinking a lot. We have a large fan on a stand in the living room aimed at his bed and he seems quite happy with that on him (not panting anymore anyway)
We just make sure theres always plenty of shade in the garden for him and keep a bowl of water with ice cubes in it out there as well.