Likely people been taught not to put water over the rumps in cool temps
because that can cause cramping, then, not knowing or not having it explained
that the temperature is what the decision is based on, they take it to mean “never”
put water over the rump muscles to cool the horse. I know many people who are
of this belief.
Kathy
This from "Vet Gates; Getting it Right" by Dr Kieran O'Brien
MRCVS: >
> "Common errors committed by crews in vat gates include... not
> cooling aggressively. Failing to apply water to all of the horse
> including the hindquarter muscle masses,>
>
>
> This goes against what I have been told at all of the rides I have
attended. I cool the lower muscles, but not the top of the hindquarters, I was told this can cause cramping.