Маленькое : преобразовать в косвенную речь "don't be afraid, nick,"-said his grandfather."this dog is very clever and it won't do you any harm."

His grandfather told Nick not to be afraid . He said that  dog was very clever and it would  not do  any harm.

Nick`s grandfother said to Nick not to be afraid.That dog was very clever and it wouldn`t do him any harm.