Steve - I think the dogs will scratch up the laminate also. It might take them longer, but ...
You sound like a well informed individual, so I guess I really can not question your 80+F statement for a "warm floor", but that still sounds quite high.
If you don't want the thermal mass, why are you putting in concrete ? I assume you are going to use a light weight, self leveling type of concrete. With that type of product, you only need it thick enough to cover the PEX so it would be closer to 1".
If this is on top of a wood framed subfloor, you should double check the framing underneath and check the subfloor for level. The self-leveling stuff really works, but if you have low spots it will be very thick and will take longer to cure. High spot are worse, because more product has to be add to the whole area.
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