Sarah should have told him that he could hurt the dog by doing that.
It is ridiculous to slam Sarah, but kids sometimes do stupid things to old loving dogs.
The relationship between a boy and his dog is sacred. They are each others best friend. They do not so much tolerate as they desire the attention of each other. The dog is happy to have his friend standing on him to achieve his heart’s desire. The picture emanates joy, love and the deepest warmth of friendship.