My pet is a big rhino

A little boy bought a rhino and found it to be unlike any other pet.
He dejectedly asked a rhino expert and learned that rhinos only pop balloons and poke holes in kites.
It wasn't until they were on their way home and encountered a robbery that the rhino understood the command.
It bravely punctured the hot air balloon and large kite the robbers used to escape,
and then carried the little boy high and far away...