In reply to Tall Clare:
The Coppermines valley might be worth a look, if you don't think the hound will like steep hills and 30 degree heat.
If you go towards the valley head below the huts and the youth hostel the river on the right is nice to play in, it's not deep there and would be enjoyable for a dog to paddle in (and a human too). (
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Post edited at 18:46