In Grade school I read a sci-fi book about earth getting attacked. A spaceship of our greatest minds was sent on a journey to a distant world to allow the human race to survive. Along the way the Aliens came across the ship and forced the people to a hash world to live. They survived many generations with mean wolf dogs and telepathic pequins. Also Gravity 4 times that of earth. They sent a message into space something like RaRwk Calling. They attack the aliens who respond and came back and saved earth. However they found they were super human and had to leave earth behind.