I plan to get her one of these:
She can use it to carry hay, grain, apples, carrots, plums, pop tarts, and soft dandy brushes (I'm thin-skinned). She will be expressly prohibited from carrying my least favorite things: syringes, sticky salves, and loose ring French link snaffles.
I can already see a bright new future ahead—with young R. being old enough to bear a burden but too young to go to school, she can pass each day in a frenzy of treat-porting activity! We shall have such fun!