谁能告诉我这段英文讲的的大概是什么?

题目

谁能告诉我这段英文讲的的大概是什么?
Come,Rover!"said Harry,as he passed a fine old Newfoundland dog that lay on a mat at the door:"come,Rover!I am going down to the river to sail my boat,and I want you to go withme."Rover opened his large eyes,and looked lazily at his littole master.
"Come!Rover!Rover!"But the dog didn't care to move,and so Harry went off to the river side alone.He had not been gone a great while before a thought of her boy came suddenly into the mother's mind.Remembering that he had a little boat,and that the river was nesr,she realized that he might might have gone there.Suddenly her hesrt began to beat with worries.
"Is Harry with you?"she called up to Harry's father,who was in his study.But Harry's father said he was not there.
"I'm afraid he's gone to the river with his boat,"said the mother.
"To the river!"And Mr Lee dropped his pen,put the book away,and came quickly down.Taking up his hat,he went hurriedly from the house.Rover was still lying upon the mat,with his head upon his paws and his eyes shut.
"Rover!"said his master,in a quick,anxious voice,"where is Harry?Has he gone to the river?Away and see!quick!"
The dog must have understood every word,for he jumped eagerly to his feet,and rushed toward the river.Mr Lee followed as fast as he could run.When he reached the river bank,he saw his little boy in the wather,witer,with Rover dragging him toward the shore.He was just in time to receive the half-drowned child in his arms,and carry him home to his mother.
Harry,who remained unconscious,was placed ina warm bed.He soon,however,came to himself,and in an hour or two was running about again.But after this,Rover would never leave the side of his little master,especially when he wandered beyond the garden gate.Wherever you found Harry,there Rover was sure to be-sometimes walking by his side,and sometimes lying on the grass,with his big eyes watching every movement.

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