Very few mammals sweat all over, but is there a benefit/reason why sweat is not used and instead other cooling functions (panting, flapping ears, wallowing) is used instead?
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Humans can wear clothes, which allows exposed skin to vary as needed: wear less clothes when it’s hot to allow sweat evaporation, and wear more clothes when it’s cold to compensate for a lack of fur.
Humans can make portable containers to carry water in, making dehydration significantly less of a threat and allowing more liberal use of precious water without having to travel back to a water source as often.
These advantages allowed early humans to act as endurance hunters to catch prey: just keep chasing even if the animal is faster than you, and eventually it will overheat and become exhausted, while you sip from your waterskin and sweat the heat away.
Animals without clothes or portable water have limited ability to cool, since they need to maintain a moderate amount of fur to protect from cold, and have more limited access to water. So sweating wouldn’t work as well even if they could do it.
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