Provacations it would talk about doing something with a secret lover. hope this helps. :)
Answer:
As soon as Shiro saw his master he ran to meet him, wagging his tail, and, seizing the end of his kimono, dragged him under a large yenoki tree. Here he began to dig very industriously with his paws, yelping with joy all the time. The old man, unable to understand what it all meant, stood looking on in bewilderment. But Shiro went on barking and digging with all his might.
Explanation:
I'm not too sure but the other parts in the story didn't seem like companionship to me, but in here the dog is helping the old man.
<em>basically im is used for not and here impossible means that anything which is not possible .. here main root or word is Possible because im is only a prefix .. this prefix 'im' changes the meaning of possible and makes it impossible :)</em>
