"The donkey landed in an atrocious manner - it was dragged several metres along the water, after which the animal was pulled out half-alive onto the shore."
Police are investigating the stunt and the entrepreneurs responsible may face criminal charges for animal cruelty.
The Brooke is the UK’s leading overseas charity dedicated to alleviating the suffering of horses, donkeys and mules.
Its advisor Kimberly Wells told Sky News Online: "This animal would have been extremely distressed, suffering immeasurable fear and pain.
I am still gobsmacked I am not allowed to put what I really think of the low-life's that done
this to the poor donkey,
that poor animal was petrified. also
there were enough people standing around watching them do this awful
...thing why didn't the so called
'on lookers' stop them from doing it. if I was there I would of done my
damned hardest to stop it happening. Ignorant the whole lot of them.