The Princess of Wales was reportedly told she was "marrying into the wrong family" after her true feelings about horses were revealed. Why doesn't Kate attend horse events often? © Tim Graham Photo Library via Get Kate can be seen photographed from behind in the halterneck dress admiring the horse"I'm allergic to horses," Kate replied. But she's been riding horses for a while, and she hopes to play polo one day. She said, 'I'm actually allergic to them, but the more time one spends with them, the less allergic you become'."