But how can something so tiny…

I have a very cute miniature pony foal, which is only 42cm tall. Her name is Sugar, because she is as sweet as sugar BUT she is very very troublesome. She gets into the pantry, nibbles your hair, destroys furniture and worst of all tries to kill my OTTB Wally who is 16.1 hands high! And sometimes I say “ But how can something so tiny be so naughty?” So I take her to a vet, who says she doesn’t know and to take her to an animal specialist. I go there. The lady said it is probably because she has no manners and needs to be trained. Another reason  could be because she is bored. I take her home, work on the training and she is fixed!