Great question — answering as the UphillTech team:
I actually answered a similar question over on Pets not long ago... Warm weather walkies and water ... however you've asked in a bit more detail so here goes... How can I know that the dog is perfectly hydrated? The dog will refuse water given to them if they feel like they've had enough to drink - this is a slim balance especially in male dogs, as it's a fine line between him wanting to mark (lots of short pees) and therefore needing more to drink. But if your dog refuses water on a hike, they're probably not thirsty yet... but keep offering them water, especially when they start to pant more (this isn't a clear definitive reason to give water as they pant from excitement too!). Also if...
Full answer by Aravona: https://outdoors.stackexchange.com/a/10247 (CC BY-SA 3.0).
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