Then demonstrate it.
I did, right at the beginning - bad memory?
Elephants understand pointing, scientists show
"Most other animals do not point, nor do they understand pointing when others do it. Even our closest relatives, the great apes, typically fail to understand pointing when it's done for them by human carers; in contrast, the domestic dog, adapted to working with humans over many thousands of years and sometimes selectively bred to follow pointing, is able to follow human pointing – a skill the dogs probably learn from repeated, one-to-one interactions with their owners."